Pass extra args to custom create command (#972)

This is needed to allow custom deploy commands to handle arbitrary args.

* Adds a `DeploymentContext.modify_yaml` helper
* Removes `laconicd` from test stack to simplify it

Reviewed-on: cerc-io/stack-orchestrator#972
Reviewed-by: ashwin <ashwin@noreply.git.vdb.to>

stack_orchestrator/deploy/deployment_context.py

@@ -45,11 +45,14 @@ class DeploymentContext:
     def get_compose_dir(self):
         return self.deployment_dir.joinpath(constants.compose_dir_name)
 
+    def get_compose_file(self, name: str):
+        return self.get_compose_dir() / f"docker-compose-{name}.yml"
+
     def get_cluster_id(self):
         return self.id
 
-    def init(self, dir):
-        self.deployment_dir = dir
+    def init(self, dir: Path):
+        self.deployment_dir = dir.absolute()
         self.spec = Spec()
         self.spec.init_from_file(self.get_spec_file())
         self.stack = Stack(self.spec.obj["stack"])
@@ -66,3 +69,19 @@ class DeploymentContext:
             unique_cluster_descriptor = f"{path},{self.get_stack_file()},None,None"
             hash = hashlib.md5(unique_cluster_descriptor.encode()).hexdigest()[:16]
             self.id = f"{constants.cluster_name_prefix}{hash}"
+
+    def modify_yaml(self, file_path: Path, modifier_func):
+        """
+        Load a YAML from the deployment, apply a modification function, and write it back.
+        """
+        if not file_path.absolute().is_relative_to(self.deployment_dir):
+            raise ValueError(f"File is not inside deployment directory: {file_path}")
+
+        yaml = get_yaml()
+        with open(file_path, 'r') as f:
+            yaml_data = yaml.load(f)
+
+        modifier_func(yaml_data)
+
+        with open(file_path, 'w') as f:
+            yaml.dump(yaml_data, f)