auto get available port in dev

[await-ovo]

Is your feature request related to a problem? Please describe.

Currently, if port 1234 is occupied, an error is thrown directly, but there is no way to change the port.

Describe the solution you'd like

• There should be a way to specify the port when dev, for example lagon dev --port 8000
• Ability to automatically get available port(get-port-please)

[QuiiBz]

Good idea. We could also add the --host(name?) option, which currently defaults to localhost.

But not sure about adding another dependency for ports, it should be easily feasible. Next.js does it in a few lines of code: https://github.com/vercel/next.js/blob/9342a6ccc7f59e5de481577be61859cf5372be0e/packages/next/server/lib/start-server.ts#L26

[await-ovo]

Good idea. We could also add the --host(name?) option, which currently defaults to localhost.

But not sure about adding another dependency for ports, it should be easily feasible. Next.js does it in a few lines of code: https://github.com/vercel/next.js/blob/9342a6ccc7f59e5de481577be61859cf5372be0e/packages/next/server/lib/start-server.ts#L26

Looks good, I can submit a pr later~