ci(azure-pipelines): remove yaml anchor

azure-pipelines.yaml

@@ -6,7 +6,7 @@ pool: 'Prod Private Agent Pool'
 
 jobs:
 - job: HelloWorld
-  container: &ubuntu
+  container:
     image: 'devfra.azurecr.io/de.fraport.trusted/ubuntu:22.04'
     endpoint: devfra
   steps:
@@ -17,7 +17,9 @@ jobs:
       echo See https://aka.ms/yaml
     displayName: 'Run a multi-line script'
 - job: ContainerTest
-  container: *ubuntu
+  container:
+    image: 'devfra.azurecr.io/de.fraport.trusted/ubuntu:22.04'
+    endpoint: devfra
   steps:
     - task: Docker@2
       displayName: Image build test
@@ -26,4 +28,3 @@ jobs:
         Dockerfile: docker/backend/Dockerfile
         buildContext: .
         tags: backend
-