forking rust-buildkit

[edrevo]

hi @denzp! i wanted to make you aware that i have temporarily forked your project at https://github.com/edrevo/dockerfile-plus i would love to contribute back the (admittedly small) changes i have made to the projects if that's OK, and depend upon an official version of buildkit-proto and buildkit-llb

i am not a lawyer, so if i did anything wrong while forking your code, please do let me know and i'll fix it right away.

cheers and thanks for the awesome project!