fix: add labeler action

Whilst we had added labeles to GHA config, we forgot to add the actual
action doing the labeling.

Co-authored-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
Signed-off-by: Milos Gajdos <milosthegajdos@gmail.com>

.github/labeler.yml

@@ -36,6 +36,9 @@ area/storage/gcs:
 area/storage/azure:
   - registry/storage/azure
 
+area/cache:
+  - registry/storage/cache
+
 area/auth:
   - registry/auth
 

.github/workflows/label.yaml

@@ -0,0 +1,19 @@
+name: Pull Request Labeler
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  pull_request_target:
+
+jobs:
+  labeler:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v5
+      with:
+        dot: true