release.yml

name: Create release note.

on:
  push:
    tags:
      - "*"
  workflow_dispatch:

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Extract tag name
        shell: bash
        run: echo "RELEASE_VERSION=${GITHUB_REF##*/v}" >> $GITHUB_ENV

      - name: Extract release notes
        id: release_notes
        run: |
          RELEASE_NOTES="## Version ""$RELEASE_VERSION"$'\n'
          CURRENT_LINE=0
          while IFS= read -r line; do
            if [[ "$line" == "## [$RELEASE_VERSION] - "* ]]; then
              CURRENT_LINE=1
            elif [[ "$CURRENT_LINE" == 1 && "$line" == "## ["* ]]; then
              CURRENT_LINE=0
            elif [[ "$CURRENT_LINE" == 1 ]]; then
              RELEASE_NOTES="$RELEASE_NOTES"$'\n'"$line"
            fi
          done < "CHANGELOG.md"
          echo "$RELEASE_NOTES" > release_notes_diff.txt

      - name: Create Release
        uses: softprops/action-gh-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: v${{ env.RELEASE_VERSION }}
          name: v${{ env.RELEASE_VERSION }}
          body_path: ${{ github.workspace }}/release_notes_diff.txt