add macOS support

[developer-guy]

We (w/@Dentrax) can use os-matrix to build an artifact suitable for macOS, is it possible to build a buildg tool for macOS from a technical standpoint?

jobs:
  build:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [macos-latest, ubuntu-latest, windows-latest]

[developer-guy]

kindly ping @ktock

[ktock]

@developer-guy Doesn't it work to run buildg in linux VM on macOS?
SGTM about native support for macOS but buildg is based on BuildKit so we first need to fix BuildKit to support macOS.
Another possible (and easier) approach might be containerizing buildg. This might provide easier setup for macOS+Docker or lima users.

[developer-guy]

It makes a lot of sense to me, so, may I open another issue for the containerization of the buildg?

[developer-guy]

We're willing to create a Dockerfile and use Buildx to containerize building with multi-arch supported

[ktock]

It makes a lot of sense to me, so, may I open another issue for the containerization of the buildg?

We're willing to create a Dockerfile and use Buildx to containerize building with multi-arch supported

SGTM, thanks!

[developer-guy]

created another issue #46, closing this one.