actions/release-monthly/action.yml

---
# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
name: 'Release'

on:
  workflow_dispatch:
  workflow_call:
  schedule:
    - cron: '0 0 1 * *' # 1st of every month at midnight

jobs:
  release:
    name: Release
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Create Release
        shell: bash
        env:
          GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
        run: |
          # Retrieve previous release tag
          previous_tag="$(gh release list --limit 1 | awk '{ print $1 }')"
          previous_major="${previous_tag%%\.*}"
          previous_minor="${previous_tag#*.}"
          previous_minor="${previous_minor%.*}"
          previous_patch="${previous_tag##*.}"
          # Determine next release tag
          next_major_minor="$(date +'%Y').$(date +'%-m')"
          if [[ "${previous_major}.${previous_minor}" == "${next_major_minor}" ]]; then
              echo "Month release already exists for year, incrementing patch number by 1"
              next_patch="$((previous_patch + 1))"
          else
              echo "Month release does not exist for year, setting patch number to 0"
              next_patch="0"
          fi
          # Create release
          release_tag="${next_major_minor}.${next_patch}"
          gh release create "${release_tag}" \
              --repo="${GITHUB_REPOSITORY}" \
              --title="${release_tag}" \
              --generate-notes