test: prevent environment variables from overriding config file values in tests

Added a loadEnvVars parameter to InitConfig to control whether environment
variables should be loaded via viper.AutomaticEnv(). In tests, environment
variables (like ND_MUSICFOLDER) were overriding values from config test files,
causing tests to fail when these variables were set in the developer's
environment. Now tests can pass loadEnvVars=false to isolate from the
environment while production code continues to use loadEnvVars=true.

Signed-off-by: Deluan <deluan@navidrome.org>

cmd/root.go

@@ -346,7 +346,7 @@ func startPluginManager(ctx context.Context) func() error {
 // TODO: Implement some struct tags to map flags to viper
 func init() {
 	cobra.OnInitialize(func() {
-		conf.InitConfig(cfgFile)
+		conf.InitConfig(cfgFile, true)
 	})
 
 	rootCmd.PersistentFlags().StringVarP(&cfgFile, "configfile", "c", "", `config file (default "./navidrome.toml")`)