Add workflow to lock spam issues

.github/workflows/lock-spams.yml

@@ -0,0 +1,25 @@
+name: Close and lock spam issues
+
+on:
+  issues:
+    types: [labeled]
+  workflow_dispatch:
+
+jobs:
+  handle_spam:
+    if: github.event.label.name == 'spam'
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - name: Close the issue
+        run: gh issue close "$ISSUE_NUM" --reason "not planned"
+      - name: Lock the issue
+        run: |
+        if [ "$(gh api repos/"$GH_REPO"/issues/"$ISSUE_NUM" --jq '.locked')" = "false" ]; then
+          gh issue lock "$ISSUE_NUM" --reason "spam"
+        fi
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      GH_REPO: ${{ github.repository }}
+      ISSUE_NUM: ${{ github.event.issue.number }}