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>

conf/configuration_test.go

@@ -31,7 +31,7 @@ var _ = Describe("Configuration", func() {
 			filename := filepath.Join("testdata", "cfg."+format)
 
 			// Initialize config with the test file
-			conf.InitConfig(filename)
+			conf.InitConfig(filename, false)
 			// Load the configuration (with noConfigDump=true)
 			conf.Load(true)