Fix typo

frontend/Dockerfile

@@ -11,7 +11,7 @@ COPY . .
 
 ENV HOST sso.example.net
 ENV BACKEND_API_URL http://oas.localhost:5002/graphql
-ENV BASE_URL http://sso.example.net;3000
+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
 ENV USERINFO_URL http://oas.example.net:4444/userinfo