[DPE-6653] Signal outdated charm libs with a label (#396)

Author: sinclert-canonical

.github/workflows/charm_libs.yaml

@@ -0,0 +1,33 @@
+# Copyright 2025 Canonical Ltd.
+# See LICENSE file for licensing details.
+name: Check libs
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  pull_request:
+    paths-ignore:
+      - '.gitignore'
+      - '.jujuignore'
+      - 'LICENSE'
+      - '**.md'
+      - 'renovate.json'
+
+jobs:
+  lib-check:
+    name: Check libraries
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    if: ${{ github.event.pull_request.head.repo.full_name == 'canonical/mysql-router-k8s-operator' }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Check libs
+        uses: canonical/charming-actions/[email protected]
+        with:
+          credentials: "${{ secrets.CHARMHUB_TOKEN }}"
+          github-token: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/ci.yaml

@@ -46,26 +46,6 @@ jobs:
       - name: Run tests
         run: tox run -e unit
 
-  lib-check:
-    name: Check libraries
-    runs-on: ubuntu-latest
-    timeout-minutes: 5
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-      - run: |
-          # Workaround for https://github.com/canonical/charmcraft/issues/1389#issuecomment-1880921728
-          touch requirements.txt
-      - name: Check libs
-        uses: canonical/charming-actions/[email protected]
-        with:
-          credentials: "${{ secrets.CHARMHUB_TOKEN }}"
-          github-token: "${{ secrets.GITHUB_TOKEN }}"
-          use-labels: false
-          fail-build: ${{ github.event_name == 'pull_request' }}
-
   build:
     name: Build charm
     uses: canonical/data-platform-workflows/.github/workflows/[email protected]