Introduce variables for services

Author: schurpl

src/main/resources/application-prod.properties

@@ -8,9 +8,9 @@ spring.jpa.show-sql=false
 spring.sql.init.continue-on-error=true
 spring.jpa.hibernate.ddl-auto=update
 
-course_service.url=http://localhost:3500/v1.0/invoke/course-service/method/graphql
-content_service.url=http://localhost:3500/v1.0/invoke/content-service/method/graphql
-user_service.url=http://localhost:3500/v1.0/invoke/user-service/method/graphql
+course_service.url=${COURSE_SERVICE_URL:http://app-course:2001/graphql}
+content_service.url=${CONTENT_SERVICE_URL:http://app-content:4001/graphql}
+user_service.url=${USER_SERVICE_URL:http://app-user:5001/graphql}
 
 github.organization_name=${GITHUB_ORG_NAME:MEITREX-TEST}