ci(action): enforces an upper limit of 5 open PRs by a single user

.github/workflows/limit-prs.yml

@@ -0,0 +1,39 @@
+name: Limit Open PRs
+
+on: 
+  pull_request:
+    types: [opened, reopened, synchronize, labeled, unlabeled]
+
+jobs:
+  limit_prs:
+    if: ${{ !contains(github.event.pull_request.labels.*.name, 'approved') }}
+    runs-on: ubuntu-latest
+    permissions: write-all
+    steps:
+    - name: Check open pull requests
+      uses: actions/github-script@v6
+      with:
+        script: |
+          const openPRs = await github.rest.pulls.list({
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            state: 'open',
+            author: context.payload.sender.login,
+          });
+
+          const hasHacktoberfestAcceptedLabel = await github.rest.issues.listLabelsOnIssue({
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            issue_number: context.payload.pull_request.number,
+          }).then(response => response.data.some(label => label.name === 'hacktoberfest-accepted'));
+
+          if (openPRs.data.length > 5 && !hasHacktoberfestAcceptedLabel) {
+            const message = `You already have ${openPRs.data.length-1} other open pull requests. Please focus on completing those before opening new ones. Do not open additional PRs until those are resolved.`;
+            await github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: message
+            });
+            core.setFailed(message);
+          }