worker: make default config values more idiomatic

The only functional change is that
base_path = ""

will be now parsed as:

config.BasePath == ""

which wasn't possible before.

Signed-off-by: Ondřej Budai <ondrej@budai.cz>

cmd/osbuild-worker/config.go

@@ -64,7 +64,11 @@ type workerConfig struct {
 }
 
 func parseConfig(file string) (*workerConfig, error) {
-	var config workerConfig
+	// set defaults
+	config := workerConfig{
+		BasePath: "/api/worker/v1",
+	}
+
 	_, err := toml.DecodeFile(file, &config)
 	if err != nil {
 		// Return error only when we failed to decode the file.
@@ -75,9 +79,6 @@ func parseConfig(file string) (*workerConfig, error) {
 
 		logrus.Info("Configuration file not found, using defaults")
 	}
-	if config.BasePath == "" {
-		config.BasePath = "/api/worker/v1"
-	}
 
 	return &config, nil
 }