feat: dart_frog build -p (specifies port)

[a-wallen]

Description

GCP allows sidecar images. The ingress image must handle requests on 8080, so that port is reserved.

My sidecar image needs a liveness probe.

It can't also run on 8080.

So, I want to be able to call dart_frog build -p 8181.

Looks like the main function reads from Platform.environment already.

void main() async {
  final address = InternetAddress.anyIPv6;
  final port = int.tryParse(Platform.environment['PORT'] ?? '8080') ?? 8080;
  createServer(address, port);
}

The easiest solution is for the build command handler to set the PORT variable.

IIUC another solution would be to do it in the Dockerfile.

Another (not preferred IMO) is to modify the generated server.dart code.

Requirements

• dart_frog build -p <port> runs the server on a port.