Update Dockerfile

Update Dockerfile with changes from Magdalena Sarabia Barquero

Dockerfile

@@ -8,12 +8,13 @@ RUN yarn build:docker
 
 # production environment
 FROM nginx:stable-alpine
-ENV API_HOST postdata.uned.es
-ENV API_PORT 5000
+ENV API_HOST evi.linhd.uned.es
+ENV API_PORT 5004
+ENV REACT_APP_API_ROOT http://evi.linhd.uned.es:5004
 COPY --from=build /app/build /usr/share/nginx/html
 COPY ./docker/nginx-default.conf.template /etc/nginx/conf.d/default.conf.template
 COPY ./docker/entrypoint.sh /
 ENTRYPOINT ["/entrypoint.sh"]
 
-EXPOSE 80
+EXPOSE 8081
 CMD ["nginx", "-g", "daemon off;"]