Renovate: run tests on branches, group deps and adjust schedule to weekends (#556)

Co-authored-by: justusbunsi <sk.bunsenbrenner@gmail.com>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/556
Co-authored-by: pat-s <patrick.schratz@gmail.com>
Co-committed-by: pat-s <patrick.schratz@gmail.com>

.gitea/workflows/test-pr.yml

@@ -1,7 +1,13 @@
 name: check-and-test
 
 on:
-  - pull_request
+  pull_request:
+    branches:
+      - "*"
+  push:
+    branches:
+      - main
+      - "renovate/**"
 
 env:
   # renovate: datasource=github-releases depName=helm-unittest/helm-unittest