update associated issue check

Author: eleanorjboyd

.github/workflows/pr-file-check.yml

@@ -14,6 +14,18 @@ jobs:
     name: 'Check for changed files'
     runs-on: ubuntu-latest
     steps:
+      - name: 'Add "issue-please" label'
+        if: github.event.action == 'opened'
+        uses: actions/github-script@v6
+        with:
+          script: |
+            github.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              labels: ['issue-please']
+            })
+
       - name: 'package-lock.json matches package.json'
         uses: brettcannon/[email protected]
         with:
@@ -46,6 +58,9 @@ jobs:
         with:
           script: |
             const labels = context.payload.pull_request.labels.map(label => label.name);
+            if (labels.includes('issue-please')) {
+              core.setFailed('The "issue-please" label is present. Please associate an issue and remove the label.');
+            }
             if (!labels.includes('skip-issue-check')) {
               const issueLink = context.payload.pull_request.body.match(/https:\/\/github\.com\/\S+\/issues\/\d+/);
               if (!issueLink) {