create --load flag for build cmd

[developer-guy]

In the meantime, people need to run additional docker command (load) in order to load image to docker after building it with apko, so, it would be better to add another flag like --load for build command to provide the same experience in a single command like the following:

$ apko build --load ..

WDYT @kaniini?

[developer-guy]

I'm willing to do this, so, feel free to assign it to me 🙋🏻‍♂️

[kaniini]

I think doing it the way ko does it where there's a virtual target you can publish to which represents the local docker daemon would be better. cc @imjasonh

[imjasonh]

This came up in https://github.com/distroless/static/pull/9

Do we want apko publish apko.local to signal a local image? This should be pretty easy after we decide that.

[kaniini]

Solved by apko publish --local!