Run GH actions on pull request

.github/workflows/backend.yml

@@ -1,7 +1,10 @@
 name: backend
 on:
   workflow_dispatch:
+  pull_request:
   push:
+    branches:
+      - 'master'
 
 jobs:
   build:

.github/workflows/docker.yml

@@ -3,6 +3,9 @@ name: docker
 on:
   workflow_dispatch:
   push:
+    branches:
+      - 'master'
+  pull_request:
     paths:
       - 'backend/**'
       - 'frontend/**'

.github/workflows/docs_test.yml

@@ -2,9 +2,12 @@ name: docs test
 
 on:
   workflow_dispatch:
-  push:
+  pull_request:
     paths:
       - 'docs/**'
+  push:
+    branches:
+      - 'master'
 
 jobs:
   build:

.github/workflows/frontend.yml

@@ -2,9 +2,10 @@ name: frontend
 
 on:
   workflow_dispatch:
+  pull_request:
   push:
-    paths:
-      - 'frontend/**'
+    branches:
+      - 'master'
 
 jobs:
   build:

.github/workflows/publish_docker_image.yml

@@ -1,4 +1,4 @@
-name: Create and publish a Docker image
+name: docker publish
 
 on:
   workflow_dispatch: