build: add workflow to publish image to ghcr

.github/workflows/publish-image.yaml

@@ -0,0 +1,46 @@
+name: Publish Image to GitHub Container Registry
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+env:
+  REGISTRY: ghcr.io
+  REPOSITORY: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up docker buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Setup Env
+        run: |
+          echo "TAG=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV        
+
+      - name: Build and Push Operator image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          tags: | 
+            ${{ env.REGISTRY }}/${{ env.REPOSITORY }}:${{ env.TAG }}
+            ${{ env.REGISTRY }}/${{ env.REPOSITORY }}:latest
+          platforms: linux/amd64,linux/arm64