fix: updated default case

Author: abhishekmadan30

src/taskgraph/config.py

@@ -28,7 +28,6 @@
         Required("trust-domain"): str,
         Optional(
             "docker-image-kind",
-            default="docker-image",
             description="Name of the docker image kind (default: docker-image)",
         ): str,
         Required("task-priority"): optionally_keyed_by(

src/taskgraph/util/docker.py

@@ -209,10 +209,15 @@ def stream_context_tar(topsrcdir, context_dir, out_file, args=None):
 def image_paths(graph_config):
     """Return a map of image name to paths containing their Dockerfile."""
 
+    try:
+        docker_image_kind = graph_config["docker-image-kind"]
+    except KeyError:
+        docker_image_kind = "docker-image"
+
     config = load_yaml(
         graph_config.root_dir,
         "kinds",
-        graph_config["docker-image-kind"],
+        docker_image_kind,
         "kind.yml",
     )
 

taskcluster/config.yml

@@ -14,8 +14,6 @@ index:
 
 task-priority: low
 
-docker-image-kind: docker-image
-
 taskgraph:
     register: self_taskgraph:register
     decision-parameters: 'self_taskgraph.custom_parameters:decision_parameters'