uncloud CLI tool and 'machine add' command to bootstrap a new cluster

internal/cli/config/machine.go

@@ -0,0 +1,8 @@
+package config
+
+type MachineConnection struct {
+	User   string `toml:"user,omitempty"`
+	Host   string `toml:"host"`
+	Port   int    `toml:"port"`
+	SSHKey string `toml:"ssh_key,omitempty"`
+}