add pre-commit checks to housekeeping

.github/workflows/housekeeping.yaml

@@ -65,6 +65,9 @@ jobs:
             fi
           done
 
+      - name: rerun pre-commit checks
+        uses: pre-commit/action@v2.0.3
+
       - name: (re)generate docs
         run: |
           for train in stable incubator develop non-free deprecated; do
@@ -153,6 +156,9 @@ jobs:
             done
           done
 
+      - name: rerun pre-commit checks
+        uses: pre-commit/action@v2.0.3
+
       - name: Copy general readme to website
         run: |
           yes | cp -rf index.yaml docs/index.yaml || echo "chart-index copy failed, continuing..."