feat: add auto-merge workflow for Snyk Bot pull requests

Author: ciscoviit

.github/workflows/auto-merge.yml

@@ -0,0 +1,49 @@
+name: Auto Merge Snyk Bot PRs
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+
+jobs:
+  automerge:
+    if: >
+      github.actor == 'snyk-io[bot]' &&
+      github.event.pull_request.head.repo.full_name == github.repository
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Wait for all checks to pass
+        uses: actions/github-script@v6
+        with:
+          script: |
+            const pr = context.payload.pull_request;
+            const checks = await github.checks.listForRef({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              ref: pr.head.sha,
+            });
+            if (checks.data.check_runs.some(check => check.conclusion !== 'success')) {
+              core.setFailed('Not all checks have passed.');
+            }
+
+      - name: Merge the pull request
+        uses: actions/github-script@v6
+        with:
+          script: |
+            await github.pulls.merge({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: context.payload.pull_request.number,
+              merge_method: 'squash',
+            });