auto_merge_approved_pr.yml

name: "Auto Merge Approved PRs"

on:
  pull_request_review:
    types: [submitted]

jobs:
  auto_merge:
    runs-on: ubuntu-latest
    steps:
      - name: "Check Approvals"
        id: check
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          result-encoding: string
          script: |
            const pull_number = context.payload.pull_request.number;
            const reviews = await github.rest.pulls.listReviews({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: pull_number,
            });
            const approvals = reviews.data.filter(review => review.state === 'APPROVED');
            const approvalCount = approvals.length;
            core.info(`PR #${pull_number} has ${approvalCount} approval(s).`);
            return approvalCount >= 2;
      - name: "Merge PR"
        if: ${{ steps.check.outputs.result == 'true' }}
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const pull_number = context.payload.pull_request.number;

            // PR 정보 및 병합 가능 상태 확인
            let pr;
            for (let i = 0; i < 5; i++) { // 최대 5회 재시도
              const { data } = await github.rest.pulls.get({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: pull_number,
              });
              pr = data;

              if (pr.state !== 'open') {
                core.info(`PR #${pull_number} is not open (state: ${pr.state}).`);
                return;
              }

              if (pr.mergeable === true) {
                break; // 병합 가능하면 루프 종료
              } else if (pr.mergeable === false) {
                core.info(`PR #${pull_number} cannot be merged due to conflicts or other issues.`);
                return;
              } else {
                // mergeable이 null인 경우 (계산 중), 잠시 대기 후 재시도
                await new Promise(resolve => setTimeout(resolve, 2000)); // 2초 대기
              }
            }

            if (pr.mergeable !== true) {
              core.info(`PR #${pull_number} mergeable status is unknown after retries.`);
              return;
            }

            // PR 병합 시도
            try {
              await github.rest.pulls.merge({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: pull_number,
              });
              core.info(`PR #${pull_number} has been merged successfully.`);
            } catch (error) {
              core.info(`Failed to merge PR #${pull_number}: ${error.message}`);
            }