feat: separate env for CI

gmus-backend/ci.env

@@ -0,0 +1,9 @@
+POSTGRES_HOST=db
+POSTGRES_DATABASE=music_player_test
+POSTGRES_USER=docker
+POSTGRES_PASSWORD=docker
+POSTGRES_PORT=5432
+REDIS_URL=redis:6379
+LOG_LEVEL=0
+LIBRARY_DIRECTORY=./pkg/read
+PORT=3000

gmus-backend/pkg/config/config.go

@@ -20,6 +20,8 @@ func getEnvFile() (string, bool) {
 	switch goEnv {
 	case "test":
 		return "test.env", true
+	case "ci":
+		return "ci.env", true
 	case "development":
 		return ".env", true
 	default: