feat(backend): allow to define path to the config file (#838)

Allow to configure where the configuration file is located via the `CONFIG_FILE` environment variable

Co-authored-by: Jules Lefebvre <jules.lefebvre@diabolocom.com>

backend/src/config/config.service.ts

@@ -13,6 +13,7 @@ import { PrismaService } from "src/prisma/prisma.service";
 import { stringToTimespan } from "src/utils/date.util";
 import { parse as yamlParse } from "yaml";
 import { YamlConfig } from "../../prisma/seed/config.seed";
+import { CONFIG_FILE } from "src/constants";
 
 /**
  * ConfigService extends EventEmitter to allow listening for config updates,
@@ -42,7 +43,7 @@ export class ConfigService extends EventEmitter {
   private async loadYamlConfig() {
     let configFile: string = "";
     try {
-      configFile = fs.readFileSync("../config.yaml", "utf8");
+      configFile = fs.readFileSync(CONFIG_FILE, "utf8");
     } catch (e) {
       this.logger.log(
         "Config.yaml is not set. Falling back to UI configuration.",