create-webapp-release-tag.yml

name: Create Webapp Release Tag

on:
  push:
    branches:
      - master
    paths:
      - 'sake/**'
      - '.github/workflows/create-webapp-release-tag.yml'

permissions:
  contents: write

jobs:
  create-webapp-release-tag:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Resolve webapp release version
        id: version
        shell: bash
        run: |
          set -euo pipefail

          git fetch --tags --force

          existing_tag="$(git tag --points-at "$GITHUB_SHA" --list 'webapp/v*' | head -n 1)"

          if [[ -n "$existing_tag" ]]; then
            version="${existing_tag#webapp/v}"
            tag="$existing_tag"
            should_create_tag=false
          else
            version_date="$(date -u +'%Y.%m.%d')"
            existing_sequences="$(
              git tag --list "webapp/v${version_date}.*" \
                | sed -E "s#^webapp/v${version_date}\.##" \
                | grep -E '^[0-9]+$' || true
            )"

            if [[ -n "$existing_sequences" ]]; then
              next_sequence="$(
                printf '%s\n' "$existing_sequences" \
                  | sort -n \
                  | tail -n 1 \
                  | awk '{ print $1 + 1 }'
              )"
            else
              next_sequence=1
            fi

            version="${version_date}.${next_sequence}"
            tag="webapp/v${version}"
            should_create_tag=true
          fi

          {
            echo "version=$version"
            echo "tag=$tag"
            echo "should_create_tag=$should_create_tag"
          } >> "$GITHUB_OUTPUT"

      - name: Create webapp release tag
        if: steps.version.outputs.should_create_tag == 'true'
        shell: bash
        run: |
          set -euo pipefail
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git tag -a "${{ steps.version.outputs.tag }}" "$GITHUB_SHA" -m "Webapp ${{ steps.version.outputs.version }}"
          git push origin "${{ steps.version.outputs.tag }}"