chore: add notifications

[skip ci]

.github/workflows/ci_new.yaml

@@ -33,6 +33,17 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6
 
+      - name: Notify
+        uses: ./.github/actions/notify
+        with:
+          webhook_url: ${{ secrets.GOOGLE_WEBHOOK_URL }}
+          title: CI pipeline started
+          event_title: ${{ github.event.type }}
+          event_author: ${{ github.event.actor.login }}
+          event_body: 'No event body.'
+          event_number: ${{ github.event.id }}
+          event_url: "https://tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/actions/runs/${{ github.run_id }}"
+
       - name: Check GoReleaser
         uses: goreleaser/goreleaser-action@v7
         with: