GitHub Action to update a version file on PR merge

update-version-workflow.yml

name: Update file on PR merge
on:
  pull_request:
    branches:
      - master
      - develop
    types: closed

jobs:
  update_date:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    steps:
      - name: checkout
        uses: actions/checkout@v2
        with:
          # Fetch full depth, otherwise the last step overwrites the last commit's parent, essentially removing the graph.
          fetch-depth: 0

      - name: Update version.txt
        run: |
          sed -ri 's/(.*FileVersion = )([0-9]+)(.*)/echo "\1$((\2+1))\3"/ge' version.txt

      - name: Amend the last commit
        run: |
          git config --global user.email "gitbot@openrct2.org"
          git config --global user.name "OpenRCT2 git bot"
          git commit -a --amend --no-edit
          git push --force-with-lease
          echo "Complete"

Thanks! Just what I needed to write a bump-version script