ci(azure-pipelines): add buildah install attempt; disable BuildKit test

azure-pipelines.yaml

@@ -28,13 +28,23 @@ jobs:
 #         Dockerfile: docker/backend/Dockerfile
 #         buildContext: .
 #         tags: backend
-- job: BuildKitTest
+# - job: BuildKitTest
+#   container:
+#     image: 'devfra.azurecr.io/de.fraport.trusted/buildkit:0.12.1'
+#     endpoint: devfra
+#   steps:
+#     - script: buildctl build \
+#         --frontend=dockerfile.v0 \
+#         --local context=. \
+#         --local dockerfile=docker/backend/Dockerfile
+#       displayName: BuildKit test
+- job: CustomBuildahTest
   container:
-    image: 'devfra.azurecr.io/de.fraport.trusted/buildkit:0.12.1'
+    image: 'devfra.azurecr.io/de.fraport.trusted/ubuntu:22.04'
     endpoint: devfra
   steps:
-    - script: buildctl build \
-        --frontend=dockerfile.v0 \
-        --local context=. \
-        --local dockerfile=docker/backend/Dockerfile
-      displayName: BuildKit test
+    - script: |
+        apt-get -y update
+        apt-get -y install buildah
+        buildah bud -t fradrive-backend-test --volume .:/mnt/fradrive --file docker/backend/Dockerfile
+      displayName: Build buildah image