chore: add notification action

[skip ci]

.github/workflows/tf-acc-test.yaml

@@ -27,6 +27,9 @@ jobs:
     name: Acceptance Tests
     runs-on: stackit-docker
     steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
       - name: Notify
         uses: ./.github/actions/notify
         with:
@@ -37,9 +40,6 @@ jobs:
           event_number: ${{ github.event.id }}
           event_url: "${{ github.repositoryUrl }}"
 
-      - name: Checkout
-        uses: actions/checkout@v6
-
       - name: Run Test (workflow dispatch)
         if: ${{ github.event_name == 'workflow_dispatch' }}
         uses: ./.github/actions/acc_test