add new trigger (#6)

Author: EED85

.github/workflows/publish_docker.yml

@@ -1,14 +1,15 @@
 name: Publish Docker Image to GHCR
 
 on:
-  workflow_dispatch:
   push:
     branches:
       - main
-      - release
-      - dev
     tags:
       - 'v*.*.*' # Semantic versioning pattern
+  pull_request:
+    # This triggers on any PR, but we filter by source branch in the job
+    types: [opened, synchronize, reopened]
+  workflow_dispatch:
 
 permissions:
   contents: read
@@ -21,6 +22,16 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      # Only continue for PRs if the source branch is dev or release
+      - name: Check PR source branch
+        if: github.event_name == 'pull_request'
+        run: |
+          echo "PR source branch: ${{ github.head_ref }}"
+          if [[ "${{ github.head_ref }}" != "dev" && "${{ github.head_ref }}" != "release" ]]; then
+            echo "Not a PR from dev or release branch. Skipping workflow."
+            exit 1
+          fi
+
       - name: Log in to GHCR
         uses: docker/login-action@v3
         with:

README.md

@@ -7,9 +7,20 @@
 
 ## Github actions
 
-Workflows are centraly hosted in EED_Solutions/eed_gha_workflows.
+Workflows are centrally hosted in EED_Solutions/eed_gha_workflows.
 Please check for more details here.
 
+### Docker Publish Workflow Triggering
+
+The Docker publish workflow (`publish_docker.yml`) is triggered automatically in the following cases:
+
+- **On any push to the `main` branch.**
+- **On any tag pushed to the repository that matches semantic versioning (`v*.*.*`).**
+- **When a pull request is opened, synchronized, or reopened and the source branch is named `dev` or `release`.**
+  - Note: The workflow runs for all PRs, but will immediately exit unless the source branch is `dev` or `release`.
+
+This ensures Docker images are only built and published for main releases, version tags, and changes coming from the main development branches.
+
 ## Other
 
 Test EED85-machine