Try to modernize CI

.devcontainer/Dockerfile

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+ARG SWIFT_VERSION
+
+FROM swift:${SWIFT_VERSION}
+

.devcontainer/devcontainer.json

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+{
+    "name": "Swift",
+    "build": {
+        "dockerfile": "Dockerfile",
+        "args": {
+            "SWIFT_VERSION" : "5.8"
+        }
+    },
+    "features": {
+        "ghcr.io/devcontainers/features/common-utils:2": {
+            "installZsh": "false",
+            "username": "vscode",
+            "userUid": "1000",
+            "userGid": "1000",
+            "upgradePackages": "false"
+        },
+        "ghcr.io/devcontainers/features/git:1": {
+            "version": "os-provided",
+            "ppa": "false"
+        }
+    },
+    "runArgs": [
+        "--cap-add=SYS_PTRACE",
+        "--security-opt",
+        "seccomp=unconfined"
+    ],
+    // Configure tool-specific properties.
+    "customizations": {
+        // Configure properties specific to VS Code.
+        "vscode": {
+            // Set *default* container specific settings.json values on container create.
+            "settings": {
+                "lldb.library": "/usr/lib/liblldb.so"
+            },
+            // Add the IDs of extensions you want installed when the container is created.
+            "extensions": [
+                "sswg.swift-lang"
+            ]
+        }
+    },
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+
+    // Set `remoteUser` to `root` to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+    "remoteUser": "vscode"
+}

.github/workflows/build-and-test.yml

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+---
+name: Build and test
+
+"on":
+  push:
+    branches: [main]
+  pull_request:
+    branches: ["**"]
+
+jobs:
+
+  devcontainer:
+    name: "Devcontainer: ${{ matrix.os }}/${{ matrix.configuration }}"
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        configuration: [debug]
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+      - name: Build and Test
+        uses: devcontainers/[email protected]
+        with:
+          runCmd: swift test --explicit-target-dependency-import-check=error -c ${{ matrix.configuration }}
+
+  xcode:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+      - name: Build and Test
+        run: xcrun xcodebuild -skipPackagePluginValidation -scheme Lotsawa -destination 'platform=macOS' test
+
+  native:
+    name: "Native: ${{ matrix.os }}/${{ matrix.configuration }}"
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+
+        configuration: [debug]
+
+        include:
+          # Default values to add
+          - shell: 'bash -eo pipefail {0}'
+          - build-options: '--explicit-target-dependency-import-check=error'
+
+          # Overrides for the defaults
+          - shell: pwsh
+            os: windows-latest
+
+    runs-on: ${{ matrix.os }}
+
+    defaults:
+      run:
+        shell: ${{ matrix.shell }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+
+      - name: Setup Swift (Unices)
+        if: ${{ matrix.os != 'windows-latest' }}
+        uses: 'swift-actions/setup-swift@v1'
+        with:
+          version: 5.9
+
+      - name: Setup Swift (Windows)
+        if: ${{ matrix.os == 'windows-latest' }}
+        uses: 'compnerd/gha-setup-swift@main'
+        with:
+          github-repo: thebrowsercompany/swift-build
+          release-asset-name: installer-amd64.exe
+          release-tag-name: 20231010.3
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and Test (${{ matrix.configuration }})
+        run: >
+          swift test -c ${{ matrix.configuration }} ${{ matrix.build-options }}
+          --explicit-target-dependency-import-check=error

.github/workflows/codecov.yml

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+name: Code Coverage
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ "**" ]
+
+jobs:
+
+  codecov:
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: true
+        show-progress: false
+
+
+    - name: Test and generate code coverage report
+      run: xcrun xcodebuild -skipPackagePluginValidation -enableCodeCoverage YES -scheme Lotsawa -destination 'platform=macOS' test
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        env_vars: OS
+        fail_ci_if_error: true
+        flags: unittests
+        swift: true
+        name: codecov-umbrella
+        verbose: true