ci: publish to docker hub only for actual app changes

Signed-off-by: Eiko Wagenknecht <[email protected]>

.github/workflows/publish-docker.yml

@@ -3,7 +3,7 @@
 name: publish-docker
 on:
   push:
-    # Run on main branch commits
+    # Only run on specific commit types in main branch
     branches: [main]
     # Run after a release is created
     tags:
@@ -20,6 +20,15 @@ concurrency:
 
 jobs:
   build-and-publish:
+    # Only publish on main branch for specific commit types
+    if: |
+      github.ref == 'refs/heads/main' && (
+        startsWith(github.event.head_commit.message, 'feat:') ||
+        startsWith(github.event.head_commit.message, 'fix:') ||
+        startsWith(github.event.head_commit.message, 'perf:')
+      ) ||
+      startsWith(github.ref, 'refs/tags/v') ||
+      github.event_name == 'workflow_dispatch'
     runs-on: ubuntu-latest
     permissions:
       contents: read