Added Log level to background service (#685)

server/libs/common/src/config/app.config.ts

@@ -16,5 +16,6 @@ export const immichAppConfig: ConfigModuleOptions = {
       then: Joi.string().optional().allow(null, ''),
       otherwise: Joi.string().required(),
     }),
+    LOG_LEVEL: Joi.string().optional().valid('simple', 'verbose').default('simple'),
   }),
 };

server/libs/common/src/constants/log-level.constant.ts

@@ -0,0 +1,4 @@
+export enum ImmichLogLevel {
+  SIMPLE = 'simple',
+  VERBOSE = 'verbose',
+}