need to have these build params (#51)

Author: pgorrindo

docker-compose-sdh.yml

@@ -11,6 +11,8 @@ services:
       - backend
     ports:
       - "${ENVT_PORT}:80"
+    build:
+      context: ./gateway
 
   frontend:
     image: openmrs/openmrs-reference-application-3-frontend:${FRONTEND_TAG:-qa}
@@ -25,6 +27,8 @@ services:
       timeout: 5s
     depends_on:
       - backend
+    build:
+      context: ./frontend
 
   backend:
     image: openmrs/openmrs-reference-application-3-backend:${BACKEND_TAG:-qa}
@@ -44,6 +48,8 @@ services:
       timeout: 5s
     volumes:
       - openmrs-data:/openmrs/data
+    build:
+      context: .
 
   # MariaDB
   db: