DX: import deployment workflows (#6)

* DX: add release drafter
* DX: add PR linting
* DX: add CD workflow for pushing to version branches

.github/release-drafter.yml

@@ -0,0 +1,37 @@
+name-template: update-pip-constraints $NEXT_PATCH_VERSION
+tag-template: $NEXT_PATCH_VERSION
+
+references:
+  - main
+  - epic/*
+
+categories:
+  - title: ✨ New features
+    label: ✨ Feature
+  - title: ⚠️ Enhancements and optimizations
+    label: ⚙️ Enhancement
+  - title: ⚠️ API changes
+    label: ⚠️ Interface
+  - title: ⚠️ Changes that may affect behavior
+    label: ❗ Behavior
+  - title: 🐛 Bug fixes
+    label: 🐛 Bug
+  - title: 📝 Documentation
+    label: 📝 Docs
+  - title: 🔨 Maintenance
+    label: 🔨 Maintenance
+  - title: 🖱️ Developer Experience
+    label: 🖱️ DX
+
+change-template: "- $TITLE (#$NUMBER)"
+
+replacers:
+  - search: /([A-Z]+!?:\s*)(.*)/g
+    replace: $2
+
+sort-direction: ascending
+
+template: |
+  $CHANGES
+
+  _The full changelog as commits can be found [here](https://github.com/ComPWA/update-pip-constraints/compare/$PREVIOUS_TAG...$NEXT_PATCH_VERSION)._

.github/workflows/cd.yml

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+name: CD
+
+on:
+  release:
+    types:
+      - prereleased
+      - released
+
+jobs:
+  milestone:
+    if: startsWith(github.ref, 'refs/tags')
+    uses: ComPWA/actions/.github/workflows/close-milestone.yml@v1
+  push-to-version-branches:
+    name: Push to version branches
+    if: startsWith(github.ref, 'refs/tags') && !github.event.release.prerelease
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Configure Git credentials
+        run: |
+          git config --global user.name "GitHub Action"
+          git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
+      - name: Push to matching minor version branch
+        env:
+          TAG: ${{ github.ref_name }}
+        run: |
+          re='^(v?)([0-9]+)\.([0-9]+)\.[0-9]+'
+          if [[ $TAG =~ $re ]]; then
+            MAJOR_VERSION="${BASH_REMATCH[2]}"
+            MINOR_VERSION="${BASH_REMATCH[2]}.${BASH_REMATCH[3]}"
+            git push origin HEAD:refs/heads/v$MAJOR_VERSION --force
+            git push origin HEAD:refs/heads/v$MINOR_VERSION --force
+          fi

.github/workflows/pr-linting.yml

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+name: PR linting
+on:
+  pull_request:
+    types:
+      - edited
+      - labeled
+      - opened
+      - reopened
+      - synchronize
+      - unlabeled
+
+jobs:
+  check-labels:
+    name: Check labels
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: docker://agilepathway/pull-request-label-checker:latest
+        with:
+          any_of: >-
+            🐛 Bug,✨ Feature,⚙️ Enhancement,⚠️ Interface,❗ Behavior,📝 Docs,🔨 Maintenance,🖱️ DX
+          none_of: Epic,💫 Good first issue
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+
+  check-title:
+    name: Check title
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: npm install @compwa/commitlint-config
+      - name: Create commitlint config
+        run: |
+          echo "module.exports = {extends: ['@compwa/commitlint-config']}" > commitlint.config.js
+      - uses: JulienKode/[email protected]

.github/workflows/release-drafter.yml

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+name: Release Drafter
+
+on:
+  push:
+    branches:
+      - main
+      - epic/*
+  workflow_dispatch:
+
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: release-drafter/release-drafter@v6
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}