made datasource url changeable by user

Author: simon

docker-compose-RELEASE.yml

@@ -12,6 +12,8 @@
       - pgdata:/var/lib/postgresql/data
 
   api-server:
+    environment:
+      DB_URL: jdbc:postgresql://db:5432/bookdb
     image: openjdk:17-jdk-slim
     container_name: api-server
     depends_on:

src/main/resources/application.properties

@@ -1,6 +1,7 @@
 spring.application.name=Library-System-API
 
-spring.datasource.url=jdbc:postgresql://localhost:5432/bookdb
+spring.datasource.url=${DB_URL:jdbc:postgresql://localhost:5432/bookdb}
+
 spring.datasource.username=admin
 spring.datasource.password=admin
 spring.datasource.driver-class-name=org.postgresql.Driver