fix: update GitHub Actions to skip Docker builds for forked repositories

Author: gounthar

.github/workflows/github-docker-registry-push.yml

@@ -87,6 +87,8 @@ jobs:
             fi
           done
 
+          echo "HAS_DOCKER_CHANGES=$HAS_DOCKER_CHANGES" >> $GITHUB_ENV
+
           if [[ "$HAS_DOCKER_CHANGES" == "false" ]]; then
             echo "No Dockerfile or context directory changes. Skipping Docker image build and push steps."
             echo "Changed files: ${{ env.files }}"
@@ -103,7 +105,7 @@ jobs:
       -
         name: Login to GitHub Container Registry
         # This step logs in to GHCR
-        if: contains(env.files, 'Dockerfile')
+        if: env.HAS_DOCKER_CHANGES == 'true' && env.IS_FORK != 'true'
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
@@ -133,7 +135,7 @@ jobs:
 
       - name: Build and push a simple jenkins controller
         # This step builds and pushes a simple Jenkins controller
-        if: contains(env.files, 'dockerfiles/Dockerfile') || contains(env.files, 'dockerfiles/')
+        if: (contains(env.files, 'dockerfiles/Dockerfile') || contains(env.files, 'dockerfiles/')) && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles
@@ -143,7 +145,7 @@ jobs:
 
       - name: Build and push the jenkins agent for maven tutorial
         # This step builds and pushes the Jenkins agent for the Maven tutorial
-        if: contains(env.files, 'dockerfiles/maven/Dockerfile')
+        if: contains(env.files, 'dockerfiles/maven/Dockerfile') && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles/maven
@@ -153,7 +155,7 @@ jobs:
 
       - name: Build and push the jenkins agent for python tutorial
         # This step builds and pushes the Jenkins agent for the Python tutorial
-        if: contains(env.files, 'dockerfiles/python/Dockerfile')
+        if: contains(env.files, 'dockerfiles/python/Dockerfile') && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles/python
@@ -163,7 +165,7 @@ jobs:
 
       - name: Build and push the jenkins agent for node tutorial
         # This step builds and pushes the Jenkins agent for the Node.js tutorial
-        if: contains(env.files, 'dockerfiles/node/Dockerfile')
+        if: contains(env.files, 'dockerfiles/node/Dockerfile') && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles/node
@@ -173,7 +175,7 @@ jobs:
 
       - name: Build and push the jenkins agent for the sidekick container
         # This step builds and pushes the Jenkins agent for the sidekick container
-        if: contains(env.files, 'dockerfiles/sidekick/Dockerfile')
+        if: contains(env.files, 'dockerfiles/sidekick/Dockerfile') && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles/sidekick
@@ -183,7 +185,7 @@ jobs:
 
       - name: Build and push the jenkins agent for the agent-finding container
         # This step builds and pushes the Jenkins agent for the agent-finding container
-        if: contains(env.files, 'dockerfiles/agent-discovery/Dockerfile')
+        if: contains(env.files, 'dockerfiles/agent-discovery/Dockerfile') && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles/agent-discovery/
@@ -193,7 +195,7 @@ jobs:
 
       - name: Build and push the jenkins agent for multi-branch controller
         # This step builds and pushes the Jenkins agent for the multi-branch controller
-        if: contains(env.files, 'dockerfiles/multi/Dockerfile')
+        if: contains(env.files, 'dockerfiles/multi/Dockerfile') && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles/multi
@@ -203,7 +205,7 @@ jobs:
 
       - name: Build and push the jenkins agent for Android
         # This step builds and pushes the Jenkins agent for Android
-        if: contains(env.files, 'dockerfiles/android/Dockerfile')
+        if: contains(env.files, 'dockerfiles/android/Dockerfile') && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles/android
@@ -213,7 +215,7 @@ jobs:
 
       - name: Build and push the jenkins agent for golang tutorial
         # This step builds and pushes the Jenkins agent for the Golang tutorial
-        if: contains(env.files, 'dockerfiles/golang/Dockerfile')
+        if: contains(env.files, 'dockerfiles/golang/Dockerfile') && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles/golang
@@ -223,17 +225,17 @@ jobs:
 
       - name: Build and push the jenkins agent for cpp tutorial
         # This step builds and pushes the Jenkins agent for the C++ tutorial
-        if: contains(env.files, 'dockerfiles/cpp/Dockerfile')
+        if: contains(env.files, 'dockerfiles/cpp/Dockerfile') && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles/cpp
           platforms: linux/amd64, linux/aarch64
           push: true
           tags: ghcr.io/${{ env.REPO_NAME }}/jenkinsci-tutorials:cpp_${{ env.BRANCH }}
-      
+
       - name: Build and push the jenkins agent for dotnet tutorial
-        # This step builds and pushes the Jenkins agent for the C++ tutorial
-        if: contains(env.files, 'dockerfiles/dotnet/Dockerfile')
+        # This step builds and pushes the Jenkins agent for the .NET tutorial
+        if: contains(env.files, 'dockerfiles/dotnet/Dockerfile') && env.IS_FORK != 'true'
         uses: docker/build-push-action@v6
         with:
           context: ./dockerfiles/dotnet