alpha.yml

name: Alpha

on:
  push:
    branches:
      - master

concurrency:
  group: alpha-release
  cancel-in-progress: false

permissions:
  contents: read

jobs:
  tag:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      contents: write
    outputs:
      alpha_tag: ${{ steps.version.outputs.alpha_tag }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Compute next alpha version
        id: version
        run: |
          set -euo pipefail

          # Latest stable tag (strict semver, no pre-release suffix).
          latest="$(git tag -l 'v[0-9]*.[0-9]*.[0-9]*' --sort=-v:refname | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' | head -1 || true)"
          if [ -z "$latest" ]; then
            echo "no stable tag found; starting from v0.0.0" >&2
            latest="v0.0.0"
          fi

          base="${latest#v}"
          major="${base%%.*}"
          rest="${base#*.}"
          minor="${rest%%.*}"
          patch="${rest#*.}"
          next="v${major}.${minor}.$((patch + 1))"

          # Alpha counter: number of existing alpha tags for the next version + 1.
          count="$(git tag -l "${next}-alpha-*" | wc -l | tr -d ' ')"
          alpha="${next}-alpha-$((count + 1))"

          echo "latest stable: $latest"
          echo "next alpha:    $alpha"
          echo "alpha_tag=$alpha" >> "$GITHUB_OUTPUT"

      - name: Create and push alpha tag
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git tag -a "${{ steps.version.outputs.alpha_tag }}" -m "${{ steps.version.outputs.alpha_tag }}: automated alpha release from master"
          git push origin "${{ steps.version.outputs.alpha_tag }}"

  pipeline:
    needs: tag
    permissions:
      contents: write
      packages: write
      id-token: write
    uses: ./.github/workflows/_release-pipeline.yml
    with:
      tag: ${{ needs.tag.outputs.alpha_tag }}