Skip conditionals

- Update build workflow to skip build if the image tag already exists

Author: TheOneFromNorway

.github/workflows/build-and-push-image.yml

@@ -5,7 +5,38 @@ on:
   workflow_call:
 
 jobs:
+  # job to check if image tag is already present in ECR
+  check-image-tag:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    - name: Configure AWS Credentials
+      uses: aws-actions/configure-aws-credentials@v4
+      with:
+        role-to-assume: arn:aws:iam::820242920762:role/GitHubActionsRole
+        aws-region: eu-west-2
+    - name: Login to ECR
+      id: login-ecr
+      uses: aws-actions/amazon-ecr-login@v2
+    - name: Check if image tag exists
+      id: check-if-image-exists
+      run: |
+        DOCKER_IMAGE="${{ steps.login-ecr.outputs.registry }}/mavis/webapp:${{ github.sha }}"
+        aws ecr describe-images --repository-name mavis/webapp --image-ids imageTag="${{ github.sha }}" --region eu-west-2
+        if [ $? -eq 0 ]; then
+          echo "Image exists skipping build and push"
+          echo "IMAGE_EXISTS=True" >> $GITHUB_OUTPUT
+        else
+          echo "Image does not exist"
+          echo "IMAGE_EXISTS=False" >> $GITHUB_OUTPUT
+        fi
+    outputs:
+      IMAGE_EXISTS: ${{ steps.check-if-image-exists.outputs.IMAGE_EXISTS }}
   build:
+    if: jobs.check-image-tag.outputs.IMAGE_EXISTS == 'False'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code

.github/workflows/deploy-mavis.yml

@@ -24,10 +24,8 @@ on:
 
 jobs:
   build-and-push-image:
-    if: github.event_name == 'workflow_dispatch'
     uses: ./.github/workflows/build-and-push-image.yml
   deploy-infrastructure:
-    if: github.event_name == 'workflow_call'
     needs: build-and-push-image
     uses: ./.github/workflows/deploy-infrastructure.yml
     with: