only run CI on the main branch + pull_request

.forgejo/workflows/example-docker-compose.yml

@@ -1,7 +1,9 @@
 # SPDX-License-Identifier: MIT
 on:
-  pull_request_target:
   push:
+    branches:
+      - 'main'
+  pull_request_target:
 
 jobs:
   example-docker-compose:

.forgejo/workflows/test.yml

@@ -1,7 +1,9 @@
 name: checks
-on: 
-  - pull_request
-  - push
+on:
+  push:
+    branches:
+      - 'main'
+  pull_request:
 
 env:
   FORGEJO_HOST_PORT: 'forgejo:3000'