publish-go-runtime-version.yml

name: Publish go runtime version

on:
  push:
    branches:
      - main
    paths:
      - 'go/**'   # run only if something under go/ changed

permissions:
  contents: write   # needed to push tags with GITHUB_TOKEN

jobs:
  create_tag:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Set up Git for tagging
        run: |
          git config user.name "${{ github.actor }}"
          git config user.email "${{ github.actor }}@users.noreply.github.com"

      - name: Get latest go/ tag and increment minor
        id: get_tag
        shell: bash
        run: |
          set -euo pipefail

          # Ensure all tags are available
          git fetch --tags --force

          prefix="go/v"

          # Find the newest tag that starts with go/v*
          latest_tag="$(git tag -l "${prefix}*" --sort=-v:refname | head -n1 || true)"
          if [[ -z "${latest_tag}" ]]; then
            latest_tag="${prefix}0.0.0"
          fi
          echo "Latest tag: ${latest_tag}"

          # Strip the prefix "go/v" and parse semver
          version="${latest_tag#${prefix}}"
          IFS='.' read -r major minor patch <<< "${version}"

          # Bump minor, reset patch
          new_minor=$((minor + 1))
          new_version="${prefix}${major}.${new_minor}.0"

          echo "Next tag: ${new_version}"
          echo "tag=${new_version}" >> "$GITHUB_OUTPUT"

      - name: Create and push new tag
        run: |
          new_tag="${{ steps.get_tag.outputs.tag }}"
          git tag "${new_tag}"
          git push origin "${new_tag}"