[core] Ensure at least one label exists on issues

Author: oliviertassinari

.github/workflows/ensure-triage-label.yml

@@ -0,0 +1,35 @@
+name: Ensure triage label is present
+
+on:
+  label:
+    types:
+      - deleted
+  issues:
+    types:
+      - opened
+
+permissions: {}
+
+jobs:
+  label_issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410 # v6
+        with:
+          script: |
+            const { data: labels } = await github.rest.issues.listLabelsOnIssue({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+            });
+
+            if (labels.length <= 0) {
+              await github.rest.issues.addLabels({
+                issue_number: context.issue.number,
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                labels: ['status: needs triage']
+              })
+            }