add actions for preparing a release, and releasing a release

The `prepare release` will be executed when a tag is pushed. It does the
following things:

1. Checks out the repo
2. Installs the dependencies
3. Runs the tests
4. Creates a draft release on GitHub with the release notes pre-filled
   based on the `CHANGELOG.md` file of the current version.

Once you publish the actual release on GitHub, the `release` action will
run. This will execute the following steps:

1. Checks out the repo
2. Installs the dependencies
3. Runs the tests as a sanity check
4. Published the current version to npm

Author: RobinMalfait

.github/workflows/prepare-release.yml

@@ -0,0 +1,73 @@
+name: Prepare Release
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - 'v*'
+
+env:
+  CI: true
+
+permissions:
+  contents: read
+
+jobs:
+  prepare:
+    permissions:
+      contents: write  # for softprops/action-gh-release to create GitHub release
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [14]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+          registry-url: 'https://registry.npmjs.org'
+      #     cache: 'npm'
+      #
+      # - name: Use cached node_modules
+      #   id: cache
+      #   uses: actions/cache@v3
+      #   with:
+      #     path: node_modules
+      #     key: nodeModules-${{ hashFiles('**/package-lock.json') }}-${{ matrix.node-version }}
+      #     restore-keys: |
+      #       nodeModules-
+
+      - name: Resolve version
+        id: vars
+        run: |
+          echo "TAG_NAME=$(git describe --tags --abbrev=0)" >> $GITHUB_ENV
+
+      - name: Get release notes
+        run: |
+          RELEASE_NOTES=$(npm run release-notes --silent)
+          echo "RELEASE_NOTES<<EOF" >> $GITHUB_ENV
+          echo "$RELEASE_NOTES" >> $GITHUB_ENV
+          echo "EOF" >> $GITHUB_ENV
+
+      - name: Install dependencies
+        # if: steps.cache.outputs.cache-hit != 'true'
+        run: npm install
+        env:
+          CI: true
+
+      - name: Test
+        run: npm test
+        env:
+          CI: true
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: true
+          tag_name: ${{ env.TAG_NAME }}
+          body: ${{ env.RELEASE_NOTES }}            

.github/workflows/release.yml

@@ -0,0 +1,56 @@
+name: Release
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [14]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+          registry-url: 'https://registry.npmjs.org'
+      #     cache: 'npm'
+      #
+      # - name: Use cached node_modules
+      #   id: cache
+      #   uses: actions/cache@v3
+      #   with:
+      #     path: node_modules
+      #     key: nodeModules-${{ hashFiles('**/package-lock.json') }}-${{ matrix.node-version }}
+      #     restore-keys: |
+      #       nodeModules-
+
+      - name: Install dependencies
+        # if: steps.cache.outputs.cache-hit != 'true'
+        run: npm install
+        env:
+          CI: true
+
+      - name: Test
+        run: npm test
+        env:
+          CI: true
+
+      - name: Calculate environment variables
+        run: |
+          echo "TAG_NAME=$(npm run calculate-tag-name --silent)" >> $GITHUB_ENV
+
+      - name: Publish
+        run: npm publish --tag ${{ env.TAG_NAME }}
+        env:
+          CI: true
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}