seperate frontend and backend workflows

.github/workflows/backend.yml

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+name: CI workflow for backend
+
+on: push
+  # push:
+  #   paths:
+  #     - "backend/**"
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+          cache: gradle
+
+      - name: Test backend
+        run: |
+          cd backend
+          ./gradlew test
+
+  build-and-push-backend:
+    runs-on: ubuntu-latest
+    if: ${{ github.ref_name == 'main' }}
+    needs: test
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+          cache: gradle
+
+      - name: Build bootJar
+        run: |
+          cd backend
+          ./gradlew bootJar
+
+      - name: Build Image and Deploy
+        uses: ./.github/workflows/build-deploy.yml
+        with:
+          folder: backend
+          image_name: booking-backend
+          deployment_name: booking-backend

.github/workflows/build-deploy.yml

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+name: Reusable workflow to build and deploy
+
+on: 
+  workflow_call:
+    inputs:
+      folder:
+        required: true
+        type: string
+      image_name:
+        required: true
+        type: string
+      deployment_name:
+        required: true
+        type: string
+
+env:
+  PROJECT_ID: pivot-lab-2203
+  GKE_CLUSTER: booking-app-cluster
+  GKE_ZONE: us-west1
+  DOCKER_REGISTRY: us-west1-docker.pkg.dev/pivot-lab-2203/docker-image-repo
+
+jobs:
+  build-image-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - id: auth
+        name: Authenticate to Google Cloud
+        uses: google-github-actions/auth@v0
+        with:
+          credentials_json: '${{ secrets.GOOGLE_SA_CREDENTIALS }}'
+          token_format: access_token
+
+      - uses: docker/setup-buildx-action@v1
+
+      - uses: docker/login-action@v1
+        with:
+          registry: ${{ env.DOCKER_REGISTRY }}
+          username: oauth2accesstoken
+          password: '${{ steps.auth.outputs.access_token }}'
+
+      - name: Build and push image to artifact registry
+        uses: docker/build-push-action@v2
+        with:
+          context: ${{ inputs.folder }}
+          file: ${{ inputs.folder }}/Dockerfile
+          push: true
+          tags:  ${{ env.DOCKER_REGISTRY }}/${{ inputs.image_name }}:latest
+
+  update-image:
+    runs-on: ubuntu-latest
+    needs: build-and-push
+    steps:
+      - id: auth
+        name: Authenticate to Google Cloud
+        uses: google-github-actions/auth@v0
+        with:
+          credentials_json: '${{ secrets.GOOGLE_SA_CREDENTIALS }}'
+          token_format: access_token
+
+      - name: Set up Cloud SDK
+        uses: google-github-actions/setup-gcloud@v0
+        with:
+          project_id:  ${{ env.PROJECT_ID }}
+          install_components: kubectl
+
+      - run: |-
+          gcloud container clusters get-credentials "$GKE_CLUSTER" --zone "$GKE_ZONE"
+      
+      - name: Deploy
+        run: |-
+          kubectl rollout restart deployment ${{ inputs.deployment_name }}
+          kubectl rollout status deployment ${{ inputs.deployment_name }}
+

.github/workflows/frontend.yml

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+name: CI workflow for frontend
+
+on: push
+  # push:
+  #   paths:
+  #     - "booking-system-ui/**"
+
+jobs:
+  build-and-push-frontend:
+    runs-on: ubuntu-latest
+    if: ${{ github.ref_name == 'main' }}
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Build Image and Deploy
+        uses: ./.github/workflows/build-deploy.yml
+        with:
+          folder: backend
+          image_name: booking-backend
+          deployment_name: booking-backend