generate-release-notes.yml

name: Generate Release Notes

on:
  push:
    # Sequence of patterns matched against refs/tags
    tags:
    - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10

  workflow_dispatch: # Use for manaully trigger to debug


permissions:
  contents: write # Allow to create a release.

jobs:
  generate-release-notes:
    runs-on: ubuntu-latest
    steps:
      # This step uses Github's checkout-action: https://github.com/actions/checkout
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      # Configure Git for helm release
      - name: Configure Git
        run: |
          git config user.name "$GITHUB_ACTOR"
          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"

      - name: Set up Go
        uses: actions/setup-go@v5
        with:
          go-version-file: 'go.mod'

      - name: Check Latest Release Tag
        id: check
        run: |
          git fetch --tags --force
          latest_tag=$(git tag --sort=-creatordate | head -n 1)
          echo "latest release is ${latest_tag}"
          echo "latest_tag=${latest_tag}" >> $GITHUB_OUTPUT
          
          ./hack/match-release-tag.sh ${latest_tag}
          valid=$?
          echo "valid=${valid}" >> $GITHUB_OUTPUT

      - name: Find Second Latest Release Tag
        if: ${{ steps.check.outputs.valid }} == 0
        id: find
        run: |
          SEMVER_REGEX='^[[:space:]]{0,}v[[:digit:]]{1,}\.[[:digit:]]{1,}\.[[:digit:]]{1,}(-(alpha|beta|rc)\.[[:digit:]]{1,}){0,1}[[:space:]]{0,}$'
          PRERELEASE_SEMVER_REGEX='^v?[0-9]+\.[0-9]+\.[0-9]+-[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*$'
          STABLE_RELEASE_SEMVER_REGEX='^v?[0-9]+\.[0-9]+\.[0-9]+$'

          latest_tag=${{ steps.check.outputs.latest_tag }}

          if [[ ${latest_tag} =~ ${PRERELEASE_SEMVER_REGEX} ]]; then
            second_latest_release_tag=$(git tag --sort=-v:refname | grep -E ${SEMVER_REGEX} | awk "p{print; exit} /${latest_tag}/{p=1}")
            echo "${latest_tag} is a pre-release, return second latest release tag ${second_latest_release_tag}"
            echo "pre_release=1" >> $GITHUB_OUTPUT
          else
            second_latest_release_tag=$(git tag --sort=-v:refname | grep -E ${STABLE_RELEASE_SEMVER_REGEX} | awk "p{print; exit} /${latest_tag}/{p=1}")
            echo "${latest_tag} is a stable release, return second stable release tag ${second_latest_release_tag}"
            echo "pre_release=0" >> $GITHUB_OUTPUT
          fi
          
          echo "second_latest_release_tag=${second_latest_release_tag}" >> $GITHUB_OUTPUT

      - name: Generate Pre Release Note
        if: ${{ steps.check.outputs.valid }} == 0 && ${{ steps.find.outputs.pre_release }} == 1
        run: |
          gh release create ${{ steps.check.outputs.latest_tag }} --verify-tag --generate-notes --notes-start-tag ${{ steps.find.outputs.second_latest_release_tag }} --prerelease
        env:
          GH_TOKEN: "${{ secrets.GITHUB_TOKEN }}"

      - name: Generate Release Note
        if: ${{ steps.check.outputs.valid }} == 0 && ${{ steps.find.outputs.pre_release }} == 0
        run: |
          gh release create ${{ steps.check.outputs.latest_tag }} --verify-tag --generate-notes --notes-start-tag ${{ steps.find.outputs.second_latest_release_tag }}
        env:
          GH_TOKEN: "${{ secrets.GITHUB_TOKEN }}"