Preview: Snapcraft remote build

Is this option still available? It isn’t listed under snapcraft remote-build --help

If so, that’s useful. But if I want to build my working tree rather than HEAD (with un-staged or uncommited changes), is there a way to tell it to exclude some files?

I’m thinking particularly about node_modules which is very large and gets packaged and uploaded unnecessarily. I note that .snap files don’t get uploaded (clever), so I wondered if it’s possible to exclude other files, like with .gitignore?