feat: enables swarm cluster to connect to external agents (#3394)

Co-authored-by: Mitch Brown <mitch@mitchbrown.ca>

internal/support/cli/args.go

@@ -31,6 +31,7 @@ type Args struct {
 	Healthcheck     *HealthcheckCmd     `arg:"subcommand:healthcheck" help:"checks if the server is running"`
 	Generate        *GenerateCmd        `arg:"subcommand:generate" help:"generates a configuration file for simple auth"`
 	Agent           *AgentCmd           `arg:"subcommand:agent" help:"starts the agent"`
+	AgentTest       *AgentTestCmd       `arg:"subcommand:agent-test" help:"tests an agent"`
 }
 
 type HealthcheckCmd struct {
@@ -40,6 +41,10 @@ type AgentCmd struct {
 	Addr string `arg:"env:DOZZLE_AGENT_ADDR" default:":7007" help:"sets the host:port to bind for the agent"`
 }
 
+type AgentTestCmd struct {
+	Address string `arg:"positional"`
+}
+
 type GenerateCmd struct {
 	Username string `arg:"positional"`
 	Password string `arg:"--password, -p" help:"sets the password for the user"`