ci: only run tests once on push to pr

.github/workflows/charmcraft-pack.yaml

@@ -1,6 +1,10 @@
 name: Charmcraft Pack Test
 
-on: [push, pull_request, workflow_call]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
 
 jobs:
   charmcraft-pack:

.github/workflows/db-charm-tests.yaml

@@ -1,6 +1,11 @@
 name: Data Charm Tests
 
-on: [push, pull_request, workflow_call]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_call:
 
 jobs:
   db-charm-tests:

.github/workflows/framework-tests.yaml

@@ -1,6 +1,11 @@
 name: ops Tests
 
-on: [push, pull_request, workflow_call]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_call:
 
 jobs:
   lint:

.github/workflows/hello-charm-tests.yaml

@@ -1,6 +1,11 @@
 name: Hello Charm Tests
 
-on: [push, pull_request, workflow_call]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_call:
 
 jobs:
   hello-charm-tests:

.github/workflows/observability-charm-tests.yaml

@@ -1,6 +1,11 @@
 name: Observability Charm Tests
 
-on: [push, pull_request, workflow_call]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_call:
 
 jobs:
   o11y-charm-tests: