Change default values to be consistent

frontend/Dockerfile

@@ -10,7 +10,7 @@ RUN npm install
 COPY . .
 
 ENV HOST sso.example.net
-ENV BACKEND_API_URL http://oas.localhost:5002/graphql
+ENV BACKEND_API_URL http://sso.example.net:5002/graphql
 ENV BASE_URL http://sso.example.net:3000
 ENV HYDRA_BASE_URL http://oas.example.net:4444
 ENV AUTHORIZE_URL http://oas.example.net:4444/oauth2/auth