create-release.yml

name: Update version and create release

on:
  pull_request:
    types: [closed]
    branches: 
      - master

jobs:

  fetch-version:
    if: github.event.pull_request.merged
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Fetch latest release version
        id: fetch-latest-release
        uses: reloc8/action-latest-release-version@1.0.0
      - uses: actions/setup-python@v2
        with:
          python-version: 3.7
      - name: Choose new release version
        id: choose-release-version
        uses: reloc8/action-choose-release-version@1.0.0
        with:
          source-branch: ${{ github.event.pull_request.head.ref }}
          latest-version: ${{ steps.fetch-latest-release.outputs.latest-release }}
    outputs:
      new-version: ${{ steps.choose-release-version.outputs.new-version }}

  update-version:
    needs: fetch-version
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: git pull --ff-only
      - name: Update version file
        run: echo ${{ needs.fetch-version.outputs.new-version }} > version
      - name: Push local repository changes
        id: push-local-repository-changes
        uses: reloc8/action-push-local-changes@1.0.0
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          commit-message: "Version ${{ needs.fetch-version.outputs.new-version }}"
    outputs:
      commit-hash: ${{ steps.push-local-repository-changes.outputs.commit-hash }}

  create-release:
    needs: [fetch-version, update-version]
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: git pull --ff-only
      - name: Create new release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: ${{ needs.fetch-version.outputs.new-version }}
          release_name: ${{ needs.fetch-version.outputs.new-version }}
          draft: false
          prerelease: false
          commitish: ${{ needs.update-version.outputs.commit-hash }}