chore(docker): set default value in db environment

Author: kusuri12-09

compose.yaml

@@ -34,9 +34,9 @@ services:
     ports:
       - '8080:8080'
     environment:
-      SPRING_DATASOURCE_URL: jdbc:postgresql://postgres:5432/${POSTGRES_NAME}
-      SPRING_DATASOURCE_USERNAME: ${POSTGRES_USER}
-      SPRING_DATASOURCE_PASSWORD: ${POSTGRES_PASSWORD}
+      SPRING_DATASOURCE_URL: jdbc:postgresql://postgres-db:5432/hear
+      SPRING_DATASOURCE_USERNAME: user
+      SPRING_DATASOURCE_PASSWORD: secret
     env_file:
       - .env
     depends_on: