ease docker conf

back-skeleton/.env.sample

-DATABASE_USER=
-DATABASE_PASSWORD=
-DATABASE_NAME=
+DATABASE_USER=usr
+DATABASE_PASSWORD=pwd
+DATABASE_NAME=database

back-skeleton/docker-compose.yml

@@ -7,11 +7,11 @@ services:
     networks:
       - db
     env_file:
-      - .env
+      - .env.sample
     environment:
-      POSTGRES_USER : ${DATABASE_USER}
-      POSTGRES_PASSWORD: ${DATABASE_PASSWORD}
-      POSTGRES_DB: ${DATABASE_NAME}
+      POSTGRES_USER : usr
+      POSTGRES_PASSWORD: pwd
+      POSTGRES_DB: database
     volumes:
       - db-data:/var/lib/postgresql/data
       - ./initdb:/docker-entrypoint-initdb.d:ro

back-skeleton/src/main/resources/application.properties

-spring.datasource.url=jdbc:postgresql://localhost:5432/${DATABASE_NAME}
-spring.datasource.username=${DATABASE_USER}
-spring.datasource.password=${DATABASE_PASSWORD}
+spring.datasource.url=jdbc:postgresql://localhost:5432/${DATABASE_NAME:usr}
+spring.datasource.username=${DATABASE_USER:pwd}
+spring.datasource.password=${DATABASE_PASSWORD:database}
 spring.servlet.multipart.max-file-size=10MB
 spring.servlet.multipart.max-request-size=10MB
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