change conditions on deployment triggering

Author: golubevtanya

.github/workflows/build-and-deploy-backend.yaml

@@ -46,7 +46,7 @@ jobs:
         with:
           push: true
           tags: |
-             ${{ env.REPOSITORY_REGION }}-docker.pkg.dev/${{ env.PROJECT_ID }}/${{ env.REPO_NAME }}/${{ env.IMAGE_NAME }}:${{ github.event.head_commit.message }}
+             ${{ env.REPOSITORY_REGION }}-docker.pkg.dev/${{ env.PROJECT_ID }}/${{ env.REPO_NAME }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
           context: ./backend
 
       - id: 'auth'