Add workflow to auto-merge PRs

.github/workflows/auto-merge.yml

@@ -0,0 +1,145 @@
+name: Auto-merge PRs
+
+on:
+  schedule:
+    - cron: '*/15 * * * *'
+  workflow_dispatch:
+  workflow_call:
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  auto-merge:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check and merge eligible PRs
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+
+            // Get the default branch
+            const { data: repository } = await github.rest.repos.get({ owner, repo });
+            const defaultBranch = repository.default_branch;
+
+            core.info(`Checking PRs against ${owner}/${repo}:${defaultBranch}`);
+
+            // Get all open PRs against the default branch
+            const { data: pullRequests } = await github.rest.pulls.list({
+              owner,
+              repo,
+              state: 'open',
+              base: defaultBranch,
+              per_page: 100
+            });
+
+            core.info(`Found ${pullRequests.length} open PRs`);
+
+            // Process each PR
+            for (const pr of pullRequests) {
+              core.startGroup(`PR #${pr.number} (${pr.html_url}): ${pr.title}`);
+
+              try {
+                // Check if PR has 'auto-merge' label
+                const hasAutoMergeLabel = pr.labels.some(label => label.name === 'auto-merge');
+                if (!hasAutoMergeLabel) {
+                  core.info(`❌ Missing 'auto-merge' label`);
+                  continue;
+                }
+                core.info(`✅ Has 'auto-merge' label`);
+
+                // Check if PR has been open for at least 2 days
+                const createdAt = new Date(pr.created_at);
+                const now = new Date();
+                const daysSinceCreation = (now - createdAt) / (1000 * 60 * 60 * 24);
+
+                if (daysSinceCreation < 2) {
+                  core.info(`❌ PR opened ${daysSinceCreation.toFixed(2)} days ago (needs 2+ days)`);
+                  continue;
+                }
+                core.info(`✅ PR opened ${daysSinceCreation.toFixed(2)} days ago`);
+
+                // Get the most recent commit
+                const { data: commits } = await github.rest.pulls.listCommits({
+                  owner,
+                  repo,
+                  pull_number: pr.number,
+                  per_page: 100
+                });
+
+                if (commits.length === 0) {
+                  core.info(`❌ No commits found`);
+                  continue;
+                }
+
+                const latestCommit = commits[commits.length - 1];
+                const latestCommitDate = new Date(latestCommit.commit.committer.date);
+                core.info(`Latest commit: ${latestCommit.sha.substring(0, 7)} at ${latestCommitDate.toISOString()}`);
+
+                // Get reviews for this PR
+                const { data: reviews } = await github.rest.pulls.listReviews({
+                  owner,
+                  repo,
+                  pull_number: pr.number,
+                  per_page: 100
+                });
+
+                const latestApproval = reviews
+                  .filter(review => review.state === 'APPROVED')
+                  .sort((a, b) => new Date(b.submitted_at) - new Date(a.submitted_at))[0];
+
+                if (!latestApproval) {
+                  core.info(`❌ No approvals found`);
+                  continue;
+                }
+
+                const latestApprovalDate = new Date(latestApproval.submitted_at);
+                core.info(`Latest approval: ${latestApproval.user.login} at ${latestApprovalDate.toISOString()}`);
+
+                if (latestApprovalDate < latestCommitDate) {
+                  core.info(`❌ Latest approval is older than the latest commit`);
+                  continue;
+                }
+                core.info(`✅ Has valid approval after latest commit`);
+
+                // Check if PR is mergeable
+                // We need to fetch the PR again to get the mergeable state
+                const { data: prDetails } = await github.rest.pulls.get({
+                  owner,
+                  repo,
+                  pull_number: pr.number
+                });
+
+                if (prDetails.mergeable === false) {
+                  core.info(`❌ PR has merge conflicts`);
+                  continue;
+                }
+
+                if (prDetails.mergeable_state === 'blocked') {
+                  core.info(`❌ PR is blocked (required checks may not have passed)`);
+                  continue;
+                }
+
+                core.info(`✅ PR is mergeable (state: ${prDetails.mergeable_state})`);
+
+                // All conditions met - merge the PR
+                try {
+                  await github.rest.pulls.merge({
+                    owner,
+                    repo,
+                    pull_number: pr.number,
+                    merge_method: 'squash'
+                  });
+                  core.notice(`🚀 Successfully merged PR #${pr.number} (${pr.html_url})`);
+                } catch (error) {
+                  core.error(`❌ Failed to merge PR #${pr.number} (${pr.html_url}): ${error.message}`);
+                }
+              } finally {
+                core.endGroup();
+              }
+            }
+
+            core.info('Auto-merge check complete');