Cannot select PGP key when signing files

[lxohi]

Hi,

I'm trying to publish my project to Maven Central using mill.

Setting up is quite fast & easy. But then I discovered that I cannot select the key used in PGP signing meanwhile there are multiple key pairs in my local machine.

I think maybe add a protected Option[String] member to PublishModule that specifies the key name and pass it all the way to here and then use it as the -u param of the gpg command will solve this issue.

What do you think about this change? If it's good, may I create a PR for this?

[lihaoyi]

sure

[lihaoyi]

@lxohi I would prefer just passing in the key name as a flag to PublishModule.publishAll

[lxohi]

OK. I'll send a PR later that passing the key name as a flag.

[lxohi]

Closed due to #530 was already merged.