release.yml

name: Release

on:
  push:
    tags: ['v*']

permissions: {}
jobs:
  release:
    permissions:
      contents: write  #  to create a release (actions/create-release)

    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Extract changelog
        run: |
          CHANGELOG=$(awk -v ver=$(cat version.txt) '/^## / { if (p) { exit }; if ($2 == ver) { p=1; next} } p' CHANGELOG.md)
          echo "CHANGELOG<<EOF" >> $GITHUB_ENV
          echo "$CHANGELOG" >> $GITHUB_ENV
          echo "EOF" >> $GITHUB_ENV

      - name: Create GitHub Release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: ${{ github.ref }}
          release_name: ${{ github.ref }}
          body: ${{ env.CHANGELOG }}
          draft: false
          prerelease: false