fix: Enable flags for port and cmd

Author: shortdiv

src/commands/dev/index.js

@@ -169,7 +169,7 @@ function startDevServer(settings, log, error) {
 class DevCommand extends Command {
   async run() {
     this.log(`${NETLIFYDEV} Starting Netlify Dev...`);
-    const { flags, args } = this.parse(DevCommand);
+    let { flags } = this.parse(DevCommand);
     const { api, site, config } = this.netlify;
     const functionsDir =
       flags.functions ||
@@ -184,7 +184,10 @@ class DevCommand extends Command {
     }
     process.env.NETLIFY_DEV = "true";
 
-    let settings = await serverSettings(config.dev);
+    if (flags.cmd) {
+      flags = { command: flags.cmd, ...flags };
+    }
+    let settings = await serverSettings(Object.assign(config.dev, flags));
 
     if (!(settings && settings.command)) {
       this.log(