chore: change prod config

Author: thgosi

src/main/resources/application-prod.yml

@@ -1,3 +1,8 @@
 spring:
+  datasource:
+    driver-class-name: org.postgresql.Driver
+    password: ${DB_PASSWORD:backend}
+    url: jdbc:postgresql://${DB_HOST:localhost}/${DB_NAME:backend-db}
+    username: ${DB_USERNAME:backend}
   devtools:
     add-properties: false