Tagging for ECR and git.

Author: MartinRixham

.github/workflows/build.yaml

@@ -9,6 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+
     - name: Checkout code
       uses: actions/checkout@v3
 
@@ -24,16 +25,56 @@ jobs:
       uses: aws-actions/amazon-ecr-login@v1
 
     - name: Build Docker image
+      run: docker build -t asyncdb:latest .
+
+    - name: Read version
+      id: get_version
+      run: |
+        VERSION=$(cat version)
+        echo "VERSION=$VERSION" >> $GITHUB_ENV
+
+    - name: Check if version exists in ECR
       run: |
-        docker build -t asyncdb:latest .
+        if aws ecr describe-images \
+          --repository-name asyncdb \
+          --image-ids imageTag=$VERSION \
+          --region eu-west-2 \
+          --query 'imageDetails[0].imageTags[0]' \
+          --output text 2>/dev/null | grep -q "$VERSION"; then
+          echo "Image version $VERSION already exists in ECR."
+          echo "publish=true" >> $GITHUB_OUTPUT
+          else
+            echo "publish=false" >> $GITHUB_OUTPUT
+          fi
+      env:
+        AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+        AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+        AWS_DEFAULT_REGION: eu-west-2
+        VERSION: ${{ env.VERSION }}
 
     - name: Tag Docker image for ECR
+      if: steps.check_version.outputs.publish == 'true'
       run: |
-        IMAGE_URI=${{ steps.ecr-login.outputs.registry }}/asyncdb:latest
+        IMAGE_URI=${{ steps.ecr-login.outputs.registry }}/asyncdb:$VERSION
         docker tag asyncdb:latest $IMAGE_URI
+      env:
+        VERSION: ${{ env.VERSION }}
 
     - name: Push Docker image to ECR
+      if: steps.check_version.outputs.publish == 'true'
       run: |
-        IMAGE_URI=${{ steps.ecr-login.outputs.registry }}/asyncdb:latest
+        IMAGE_URI=${{ steps.ecr-login.outputs.registry }}/asyncdb:$VERSION
         docker push $IMAGE_URI
+      env:
+        VERSION: ${{ env.VERSION }}
+
+    - name: Tag Git repo with version
+      if: steps.check_version.outputs.publish == 'true'
+      run: |
+        git config user.name "github-actions[bot]"
+        git config user.email "github-actions[bot]@users.noreply.github.com"
+        git tag "$VERSION"
+        git push origin "$VERSION"
+      env:
+        VERSION: ${{ env.VERSION }}