This adds the ability to source additional local build definition files when
sourcing Bake files via a remote url.
Prefixing a file with 'cwd://' will source a bake file on the local
machine, instead of the remote location.
Local files will be read/have precedence before remote files.
Usage:
```
docker buildx bake https://github.com/example/upstream.git --file cwd://docker-bake.override.hcl --print
```
This will source a default file from the example/upstream repository,
and also source a build definition from the local machine.
Also moves remote and local files reading logic to a func
Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
Signed-off-by: Cameron Adams <pnzreba@gmail.com>
Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>
we don't currently support reading a remote Dockerfile with a local
context when doing a remote invocation because we automatically derive
the dockerfile from the context atm. To avoid mistakenly reading a local
Dockerfile, we check if the Dockerfile exists locally and if so, we
error out.
Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
Fixed in 12b6a3ad9aeda4bdf67a6a55d22fc43594125ec4, but now we have
regression tests! So we can add a check that we don't break this
behavior again.
Signed-off-by: Justin Chadwell <me@jedevc.com>
