FIX parameter parsing - second try

cmd/drone-docker/main.go

@@ -279,6 +279,16 @@ func main() {
 			Usage:  "ssh agent key to use",
 			EnvVar: "PLUGIN_SSH_AGENT_KEY",
 		},
+		cli.BoolFlag{
+			Name:   "is-plugin",
+			Usage:  "build a plugin instead of a regular image",
+			EnvVar: "PLUGIN_IS_PLUGIN",
+		},
+		cli.StringFlag{
+			Name:   "plugin-config",
+			Usage:  "path to the plugin config.json. Defaults to config.json",
+			EnvVar: "PLUGIN_PLUGIN_CONFIG",
+		},
 	}
 
 	if err := app.Run(os.Args); err != nil {
@@ -324,8 +334,8 @@ func run(c *cli.Context) error {
 			Quiet:        c.Bool("quiet"),
 			Platform:     c.String("platform"),
 			SSHAgentKey:  c.String("ssh-agent-key"),
-			IsPlugin:     c.Bool("docker.is-plugin"),
-			PluginConfig: c.String("docker.plugin-config"),
+			IsPlugin:     c.Bool("is-plugin"),
+			PluginConfig: c.String("plugin-config"),
 		},
 		Daemon: docker.Daemon{
 			Registry:      c.String("docker.registry"),