[Feature Request] Add Support for Image Build with Specified Network

[krocd]

In newer versions of docker, the docker build command supports the use of the --network parameter to specify the network to use when executing RUN commands in the Dockerfile.

Please add support to the Portainer UI to allow selection of an existing network when building an image using the web UI.

An example use case scenario would be that you have an internal Linux repo server running as a docker service, and you need the new image build to be able to reference the service by name using docker internal service DNS. Without specifying the network to use for RUN commands (--network), the DNS request for the repo URL will not resolve.

docker build