add roles support for worker nodes

internal/config/config.go

@@ -29,6 +29,7 @@ type Config struct {
 	InventoryDir     string
 	Verbose          bool
 	KubeconfigFile   string
+	Forks            string `yaml:"forks" env-default:"10"`
 	InstallationName string `yaml:"installation_name" env-default:"cluster.local"`
 	Credentials      struct {
 		User            string `yaml:"user"`
@@ -37,7 +38,10 @@ type Config struct {
 		PrivateKeyFile  string `yaml:"private_key_file"`
 	} `yaml:"credentials"`
 
-	Hosts []Host `yaml:"hosts"`
+	Hosts struct {
+		Masters []Host `yaml:"master"`
+		Workers []Host `yaml:"worker"`
+	} `yaml:"hosts"`
 
 	Orchestrator Orchestrator `yaml:"orchestrator"`