update_versions_file.yml

# This is a github action that will update a file named “pipeline_versions.txt” (or create if it doesn’t exist) with the following content: 
# tab-delimited with columns  “pipeline name”, “version”, “date of last commit”. 

name: Update Pipeline Versions
on:
  pull_request:
    # This workflow will run on PR to develop and will update the pipeline_versions.txt file on the source branch (ie. the branch that triggered the PR)
    branches:
      - develop
  workflow_dispatch:

jobs:
  update_versions:
    runs-on: ubuntu-latest

    steps:
      # This step checks out the code - explicitly fetch the history and checkout the branch to enable us to push files back to the repo
      - name: Checkout repository
        uses: actions/checkout@v3
        with:
          ref: ${{ github.head_ref }} # This fetches the branch name that triggered the workflow
          fetch-depth: 0 # This fetches all history for all branches and tags

      # This step sets up Python environment
      - name: Set up Python
        uses: actions/setup-python@v2
        with:
          python-version: 3.x
      
      # This step updates a a file called "pipeline_versions.txt" with the names, versions, and last commit dates of all the pipelines found in the 
      # "warp/pipelines" directory by parsing the contents of the "*.changelog.md" files.
      - name: Update Pipeline Versions
        run: |
          echo "Current directory: "
          pwd
          ls -lht
          echo -e "Pipeline Name\tVersion\tDate of Last Commit" > pipeline_versions.txt
          find pipelines -name "*.changelog.md" -type f | while read -r file; do
            pipeline_name=$(basename "$file" .changelog.md)
            version=$(head -n 1 "$file" | sed 's/#//')
            last_commit_date=$(sed -n '2p' "$file" | sed 's/([^)]*)//g')
            echo -e "$pipeline_name\t$version\t$last_commit_date" >> pipeline_versions.txt
          done
        
      # This step commits and pushes the changes to the repository
      - name: Commit and push changes
        run: |
          git config --local user.email "action@github.com"
          git config --local user.name "GitHub Action"
          git add pipeline_versions.txt
          if git diff-index --quiet HEAD --; then
            echo "No changes to commit"
          else
            git commit -m "Updated pipeline_versions.txt with all pipeline version information"
            git push
          fi