update ci steps to consider presence of credentials

.github/workflows/build-and-stage.yml

@@ -1,77 +1,82 @@
-name: Build and stage
-
-on:
-  pull_request:
-    branches:
-    - main
-  push:
-    branches:
-      - main
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-permissions:
-  contents: 'read'
-  pull-requests: 'write'
-
-env:
-  IMAGE_NAME: initializr-web
-  IMAGE_TAG: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || github.run_id }}
-
-jobs:
-  build-push-deploy:
-    name: Build and push image
-    environment:
-      name: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || vars.STAGING_SLOT_NAME }}
-      url: ${{ steps.deploy-to-webapp.outputs.webapp-url }}
-    env:
-      SLOT_NAME: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || vars.STAGING_SLOT_NAME }}
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-
-    - name: Login to Azure
-      uses: azure/login@v1
-      with:
-        creds: ${{ secrets.AZURE_CREDENTIALS }}
-
-    - name: Login to container registry
-      uses: azure/docker-login@v1
-      with:
-        login-server: "${{ vars.DOCKER_REGISTRY }}"
-        username: "${{ secrets.DOCKER_USERNAME }}"
-        password: "${{ secrets.DOCKER_PASSWORD }}"
-
-    - name: Build image
-      run: docker build . --file "Dockerfile" -t ${{ vars.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}
-
-    - name: Push image
-      run: docker push ${{ vars.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}
-
-    - name: If PR, create a new staging slot
-      if: ${{ github.event_name == 'pull_request' }}
-      run: az webapp deployment slot create --resource-group ${{ vars.AZURE_RESOURCE_GROUP }} --name ${{ vars.AZURE_WEBAPP_NAME}} --slot ${{ env.SLOT_NAME }} --configuration-source ${{ vars.STAGING_SLOT_NAME }}
-
-    - name: Deploy to staging slot
-      uses: azure/webapps-deploy@v3
-      id: deploy-to-webapp
-      with: 
-        app-name: ${{ vars.AZURE_WEBAPP_NAME }}
-        images: ${{ vars.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}
-        slot-name:  ${{ env.SLOT_NAME }}
-
-    - name: If PR, comment with the preview link
-      if: ${{ github.event_name == 'pull_request' }}
-      uses: mshick/add-pr-comment@v2
-      with:
-        message: |
-          ## Preview link: https://${{ vars.AZURE_WEBAPP_NAME }}-${{ env.SLOT_NAME }}.azurewebsites.net 
-          
-          - Your changes have been deployed to the preview site. The preview site will update as you add more commits to this branch.
-          - The preview link is shareable, but will be deleted when the pull request is merged or closed.
-
-          > *This is an automated message.*
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
+name: Build and stage
+
+on:
+  pull_request:
+    branches:
+    - main
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: 'read'
+  pull-requests: 'write'
+
+env:
+  IMAGE_NAME: initializr-web
+  IMAGE_TAG: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || github.run_id }}
+  AZURE_CREDENTIALS: secrets.AZURE_CREDENTIALS
+
+jobs:
+  build-push-deploy:
+    name: Build and push image
+    environment:
+      name: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || vars.STAGING_SLOT_NAME }}
+      url: ${{ steps.deploy-to-webapp.outputs.webapp-url }}
+    env:
+      SLOT_NAME: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || vars.STAGING_SLOT_NAME }}
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Login to Azure
+      if: ${{ env.AZURE_CREDENTIALS != '' }}
+      uses: azure/login@v1
+      with:
+        creds: ${{ secrets.AZURE_CREDENTIALS }}
+
+    - name: Login to container registry
+      if: ${{ env.AZURE_CREDENTIALS != '' }}
+      uses: azure/docker-login@v1
+      with:
+        login-server: "${{ vars.DOCKER_REGISTRY }}"
+        username: "${{ secrets.DOCKER_USERNAME }}"
+        password: "${{ secrets.DOCKER_PASSWORD }}"
+
+    - name: Build image
+      run: docker build . --file "Dockerfile" -t ${{ vars.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}
+
+    - name: Push image
+      if: ${{ env.AZURE_CREDENTIALS != '' }}
+      run: docker push ${{ vars.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}
+
+    - name: If PR, create a new staging slot
+      if: ${{ github.event_name == 'pull_request' && env.AZURE_CREDENTIALS != '' }}
+      run: az webapp deployment slot create --resource-group ${{ vars.AZURE_RESOURCE_GROUP }} --name ${{ vars.AZURE_WEBAPP_NAME}} --slot ${{ env.SLOT_NAME }} --configuration-source ${{ vars.STAGING_SLOT_NAME }}
+
+    - name: Deploy to staging slot
+      if: ${{ env.AZURE_CREDENTIALS != '' }}
+      uses: azure/webapps-deploy@v3
+      id: deploy-to-webapp
+      with: 
+        app-name: ${{ vars.AZURE_WEBAPP_NAME }}
+        images: ${{ vars.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}
+        slot-name:  ${{ env.SLOT_NAME }}
+
+    - name: If PR, comment with the preview link
+      if: ${{ github.event_name == 'pull_request' && env.AZURE_CREDENTIALS != '' }}
+      uses: mshick/add-pr-comment@v2
+      with:
+        message: |
+          ## Preview link: https://${{ vars.AZURE_WEBAPP_NAME }}-${{ env.SLOT_NAME }}.azurewebsites.net 
+          
+          - Your changes have been deployed to the preview site. The preview site will update as you add more commits to this branch.
+          - The preview link is shareable, but will be deleted when the pull request is merged or closed.
+
+          > *This is an automated message.*
+        repo-token: ${{ secrets.GITHUB_TOKEN }}