diff --git a/.github/workflows/publish.yml b/.github/workflows/Publish.yml
similarity index 94%
rename from .github/workflows/publish.yml
rename to .github/workflows/Publish.yml
index 7c82c0a..7061f40 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/Publish.yml
@@ -8,7 +8,7 @@ jobs:
   publish:
     runs-on: ubuntu-22.04
     permissions:
-      id-token: write # mandatory for PyPI trusted publishing
+      id-token: write  # mandatory for PyPI trusted publishing
 
     steps:
       - uses: actions/checkout@v3
diff --git a/.github/workflows/PublishDockerDevImage.yaml b/.github/workflows/PublishDockerDevImage.yaml
new file mode 100644
index 0000000..e363cf4
--- /dev/null
+++ b/.github/workflows/PublishDockerDevImage.yaml
@@ -0,0 +1,27 @@
+name: Publish Docker dev image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  publish:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Build and push Docker image
+        uses: openzim/docker-publish-action@v10
+        with:
+          image-name: openzim/kolibri
+          manual-tag: dev
+          latest-on-tag: false
+          restrict-to: openzim/kolibri
+          registries: ghcr.io
+          credentials:
+            GHCRIO_USERNAME=${{ secrets.GHCR_USERNAME }}
+            GHCRIO_TOKEN=${{ secrets.GHCR_TOKEN }}
+          repo_description: auto
+          repo_overview: auto
diff --git a/.github/workflows/qa.yml b/.github/workflows/QA.yml
similarity index 91%
rename from .github/workflows/qa.yml
rename to .github/workflows/QA.yml
index 54c93eb..a9d2172 100644
--- a/.github/workflows/qa.yml
+++ b/.github/workflows/QA.yml
@@ -1,7 +1,10 @@
 name: QA
 
 on:
-  workflow_call:
+  pull_request:
+  push:
+    branches:
+      - main
 
 jobs:
   check-qa:
diff --git a/.github/workflows/Tests.yml b/.github/workflows/Tests.yml
index 53ace14..838269f 100644
--- a/.github/workflows/Tests.yml
+++ b/.github/workflows/Tests.yml
@@ -32,7 +32,31 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
 
-      - name: Ensure we can build targets
+  build_python:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version-file: pyproject.toml
+          architecture: x64
+
+      - name: Ensure we can build Python targets
+        run: |
+          pip install -U pip build
+          python3 -m build --sdist --wheel
+
+  build_docker:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Ensure we can build the Docker image
+        run: |
+          docker build -t testimage .
+
+      - name: Ensure we can start the Docker image
         run: |
-          pip install build
-          python3 -m build
+          docker run --rm testimage
diff --git a/.github/workflows/pull.yml b/.github/workflows/pull.yml
deleted file mode 100644
index be2b9de..0000000
--- a/.github/workflows/pull.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-name: Pull Request
-
-on:
-  pull_request:
-
-jobs:
-  qa:
-    uses: ./.github/workflows/qa.yml
-    # run qa job if the pull request originates from a fork (otherwise the qa is already triggered by the push to a branch)
-    if: github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
deleted file mode 100644
index d84f392..0000000
--- a/.github/workflows/push.yml
+++ /dev/null
@@ -1,8 +0,0 @@
-name: Push
-
-on:
-  push:
-
-jobs:
-  qa:
-    uses: ./.github/workflows/qa.yml
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 773aa1e..59efa03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- New html option in coverage report
+
+### Fixed
+- Small fixes in invoke tasks
+
+### Changed
+- Dockerfile: split installation of Python dependencies for more efficiency
+- Github workflow: publish `dev` tag on every push to `main` branch
+- Github workflow: build Docker image + test its startup
+- Github workflow: adopt new standard execution structure (`on` conditions)
+
 ## [1.1.0] - 2023-07-25
 
 ### Added
diff --git a/Dockerfile b/Dockerfile
index 743bd2b..2b96101 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,9 +11,16 @@ RUN apt-get update \
  && python -m pip install --no-cache-dir -U \
       pip
 
+# Copy pyproject.toml and its dependencies
+COPY pyproject.toml README.md get_js_deps.sh hatch_build.py /src/
+COPY src/kolibri2zim/__about__.py /src/src/kolibri2zim/__about__.py
+
+# Install Python dependencies
+RUN pip install --no-cache-dir /src
+
 # Copy code + associated artifacts
 COPY src /src/src
-COPY pyproject.toml *.md get_js_deps.sh MANIFEST.in LICENSE *.py /src/
+COPY *.md LICENSE *.py /src/
 
 # Install + cleanup
 RUN pip install --no-cache-dir /src \
diff --git a/pyproject.toml b/pyproject.toml
index 944c679..a002b7b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -79,6 +79,7 @@ run = "inv test --args '{args}'"
 run-cov = "inv test-cov --args '{args}'"
 report-cov = "inv report-cov"
 coverage = "inv coverage --args '{args}'"
+html = "inv coverage --html --args '{args}'"
 
 [tool.hatch.envs.lint]
 template = "lint"
diff --git a/tasks.py b/tasks.py
index 3370b73..90854e8 100644
--- a/tasks.py
+++ b/tasks.py
@@ -8,95 +8,102 @@
 
 
 @task(optional=["args"], help={"args": "pytest additional arguments"})
-def test(ctx: Context, args: str | None = ""):
+def test(ctx: Context, args: str = ""):
     """run tests (without coverage)"""
     ctx.run(f"pytest {args}", pty=use_pty)
 
 
 @task(optional=["args"], help={"args": "pytest additional arguments"})
-def test_cov(ctx: Context, args: str | None = ""):
+def test_cov(ctx: Context, args: str = ""):
     """run test vith coverage"""
     ctx.run(f"coverage run -m pytest {args}", pty=use_pty)
 
 
-@task()
-def report_cov(ctx: Context):
+@task(optional=["html"], help={"html": "flag to export html report"})
+def report_cov(ctx: Context, *, html: bool = False):
     """report coverage"""
     ctx.run("coverage combine", warn=True, pty=use_pty)
     ctx.run("coverage report --show-missing", pty=use_pty)
+    if html:
+        ctx.run("coverage html", pty=use_pty)
 
 
-@task(optional=["args"], help={"args": "pytest additional arguments"})
-def coverage(ctx: Context, args: str | None = ""):
+@task(
+    optional=["args", "html"],
+    help={
+        "args": "pytest additional arguments",
+        "html": "flag to export html report",
+    },
+)
+def coverage(ctx: Context, args: str = "", *, html: bool = False):
     """run tests and report coverage"""
-    test_cov(ctx, args)
-    report_cov(ctx)
+    test_cov(ctx, args=args)
+    report_cov(ctx, html=html)
 
 
-@task(
-    optional=["args"], help={"args": "linting tools (black, ruff) additional arguments"}
-)
-def lint_black(ctx: Context, args: str | None = ""):
-    args = args or "."
+@task(optional=["args"], help={"args": "black additional arguments"})
+def lint_black(ctx: Context, args: str = "."):
+    args = args or "."  # needed for hatch script
     ctx.run("black --version", pty=use_pty)
     ctx.run(f"black --check --diff {args}", pty=use_pty)
 
 
-@task(
-    optional=["args"], help={"args": "linting tools (black, ruff) additional arguments"}
-)
-def lint_ruff(ctx: Context, args: str | None = ""):
-    args = args or "."
+@task(optional=["args"], help={"args": "ruff additional arguments"})
+def lint_ruff(ctx: Context, args: str = "."):
+    args = args or "."  # needed for hatch script
     ctx.run("ruff --version", pty=use_pty)
     ctx.run(f"ruff check {args}", pty=use_pty)
 
 
 @task(
-    optional=["args"], help={"args": "linting tools (black, ruff) additional arguments"}
+    optional=["args"],
+    help={
+        "args": "linting tools (black, ruff) additional arguments, typically a path",
+    },
 )
-def lintall(ctx: Context, args: str | None = ""):
-    """check linting"""
-    args = args or "."
+def lintall(ctx: Context, args: str = "."):
+    """Check linting"""
+    args = args or "."  # needed for hatch script
     lint_black(ctx, args)
     lint_ruff(ctx, args)
 
 
 @task(optional=["args"], help={"args": "check tools (pyright) additional arguments"})
-def check_pyright(ctx: Context, args: str | None = ""):
+def check_pyright(ctx: Context, args: str = ""):
     """check static types with pyright"""
-    args = args or ""
     ctx.run("pyright --version")
     ctx.run(f"pyright {args}", pty=use_pty)
 
 
 @task(optional=["args"], help={"args": "check tools (pyright) additional arguments"})
-def checkall(ctx: Context, args: str | None = ""):
+def checkall(ctx: Context, args: str = ""):
     """check static types"""
-    args = args or ""
     check_pyright(ctx, args)
 
 
 @task(optional=["args"], help={"args": "black additional arguments"})
-def fix_black(ctx: Context, args: str | None = ""):
+def fix_black(ctx: Context, args: str = "."):
     """fix black formatting"""
-    args = args or "."
-    ctx.run(f"black {args}", pty=use_pty)  # type: ignore
+    args = args or "."  # needed for hatch script
+    ctx.run(f"black {args}", pty=use_pty)
 
 
 @task(optional=["args"], help={"args": "ruff additional arguments"})
-def fix_ruff(ctx: Context, args: str | None = ""):
+def fix_ruff(ctx: Context, args: str = "."):
     """fix all ruff rules"""
-    args = args or "."
-    ctx.run(f"ruff --fix {args}", pty=use_pty)  # type: ignore
+    args = args or "."  # needed for hatch script
+    ctx.run(f"ruff --fix {args}", pty=use_pty)
 
 
 @task(
     optional=["args"],
-    help={"args": "linting (fix mode) tools (black, ruff) additional arguments"},
+    help={
+        "args": "linting tools (black, ruff) additional arguments, typically a path",
+    },
 )
-def fixall(ctx: Context, args: str | None = ""):
-    """fix everything automatically"""
-    args = args or "."
+def fixall(ctx: Context, args: str = "."):
+    """Fix everything automatically"""
+    args = args or "."  # needed for hatch script
     fix_black(ctx, args)
     fix_ruff(ctx, args)
     lintall(ctx, args)