chore: corrects the mongo service url

Dockerfile

@@ -8,11 +8,12 @@ COPY ./app/client/package*.json ./
 
 ENV PATH /usr/src/app/node_modules/.bin:$PATH
 ENV API_URL todo-application-service:3002
+ENV MONGODB_URL todo-mongo-service:27017
 
 RUN npm install --silent
 COPY ./app/client .
 
-RUN API_URL=$API_URL node scripts/build.js
+RUN API_URL=$API_URL MONGODB_URL=$MONGODB_URL node scripts/build.js
 # Client build finished
 
 # Build Server and combine