chore(build): Add a CI workflow to build and push multiubuntu image whenever a change detected

.github/workflows/ci-build-and-push-ubuntu.yml

@@ -0,0 +1,43 @@
+name: ci-build-and-push-ubuntu
+
+on:
+  push:
+    branches:
+      - main  
+
+jobs:
+  build:
+    if: github.repository == 'kubearmor/kubearmor'
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+
+      - name: Set up QEMU for multi-architecture builds
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          platforms: linux/amd64,linux/arm64/v8
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_AUTHTOK }}
+
+      - name: Build and push multi-architecture image
+        uses: docker/build-push-action@v6
+        with:
+            context: examples/multiubuntu/build  
+            file: examples/multiubuntu/build/Dockerfile
+            push: true
+            tags: kubearmor/ubuntu-w-utils:latest
+            platforms: linux/amd64,linux/arm64/v8 
+
+      - name: Logout from Docker Hub
+        run: docker logout

.github/workflows/ci-test-ginkgo.yml

@@ -10,6 +10,7 @@ on:
       - ".github/workflows/ci-test-ginkgo.yml"
       - "pkg/KubeArmorOperator/**"
       - "deployments/helm/**"
+      - "examples/multiubuntu/build/**"
   pull_request:
     branches: [main]
     paths: