send build context to dockerfile

.drone.yml

@@ -2,6 +2,6 @@ pipeline:
   build-plugin:
     image: docker
     commands:
-      - cat Dockerfile | docker build -t goat-deploy-plugin -
+      - docker build -t goat-deploy-plugin .
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock