BREAKING CHANGE: move Uncloud API socket to /run/uncloud/api/uncloud.sock, activate it by systemd socket unit

cmd/uc/machine/add.go

@@ -192,7 +192,7 @@ func add(ctx context.Context, uncli *cli.CLI, remoteMachine *cli.RemoteMachine,
 	// Deploy a Caddy service container to the added machine. If caddy service is already deployed on other machines,
 	// use the deployed image version.
 	// NOTE: We use the cluster client to inspect and scale the Caddy service because the newly added machine may have
-	// issues accessing the Machine API of existing machines in the cluster.
+	// issues accessing the API of existing machines in the cluster.
 	// See the issue for more details: https://github.com/psviderski/uncloud/issues/65.
 	caddyImage := ""
 	caddySvc, err := clusterClient.InspectService(ctx, client.CaddyServiceName)

cmd/uc/main.go

@@ -88,10 +88,11 @@ func main() {
 
 			configPath := fs.ExpandHomeDir(opts.configPath)
 
+			// Make uc connect via the local Unix socket when running on a cluster machine.
 			if opts.connect == "" {
-				if !fs.Exists(configPath) && fs.Exists(machine.DefaultUncloudSockPath) {
+				if !fs.Exists(configPath) && fs.Exists(machine.DefaultClusterAPISockPath) {
 					conn = &config.MachineConnection{
-						Unix: machine.DefaultUncloudSockPath,
+						Unix: machine.DefaultClusterAPISockPath,
 					}
 				}
 			}