chore: update context path for maas-controller (#77925)

Author: ishitasequeira

ci-operator/config/opendatahub-io/models-as-a-service/opendatahub-io-models-as-a-service-main.yaml

@@ -16,8 +16,8 @@ images:
   - context_dir: maas-api/
     dockerfile_path: Dockerfile
     to: maas-api
-  - context_dir: maas-controller/
-    dockerfile_path: Dockerfile
+  - context_dir: .
+    dockerfile_path: maas-controller/Dockerfile
     to: maas-controller
   skip_if_only_changed: ^docs/|\.md$|^(?:.*/)?(?:\.gitignore|OWNERS|PROJECT|LICENSE|CONTRIBUTING\.md)$|^\.github/|^\.tekton/
 promotion: