Added workflow for image build

.github/workflows/docker-image.yaml

@@ -0,0 +1,57 @@
+name: Build and Push Backstage Image
+
+on:
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: "branch to build"
+        required: true
+        default: backstage-image
+  push:
+    branches:
+      - backstage-image
+
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+      with:
+        ref: cnoe
+       
+    - name: Install packages
+      run: NODE_OPTIONS="--max_old_space_size=4096" yarn install
+      
+    - name: Sanity check
+      run: NODE_OPTIONS="--max_old_space_size=4096" yarn tsc
+      
+    - name: Bundle up
+      run: NODE_OPTIONS="--max_old_space_size=4096" yarn build:all
+       
+    - name: Configure AWS credentials
+      uses: aws-actions/configure-aws-credentials@v2
+      with:
+        aws-access-key-id: ${{ secrets.ACCESS_KEY }}
+        aws-secret-access-key: ${{ secrets.SECRET_KEY }}
+        aws-region: us-east-1
+
+    - name: Login to Amazon ECR
+      id: login-ecr
+      uses: aws-actions/amazon-ecr-login@v1
+
+    - name: Build, tag, and push the image to Amazon ECR
+      id: build-image
+      env:
+        ECR_REGISTRY: ${{ steps.login-ecr.outputs.registry }}
+        ECR_REPOSITORY: ${{ secrets.REPO_NAME }}
+        IMAGE_TAG: ${{ github.sha }}
+      run: |
+        # Build a docker container and push it to ECR 
+        docker build -t $ECR_REGISTRY/$ECR_REPOSITORY:$IMAGE_TAG .
+        echo "Pushing image to ECR..."
+        docker push $ECR_REGISTRY/$ECR_REPOSITORY:$IMAGE_TAG
+        echo "name=image::$ECR_REGISTRY/$ECR_REPOSITORY:$IMAGE_TAG" >> $GITHUB_OUTPUT