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This introduces a debug variant of the buildkit docker image. This version builds the binary in a way that disables optimizations so that it can be run properly with delve. It also builds and installs delve only in the debug variant of the image. For the debug variant, a shim `buildkitd` binary is created that execs with the proper arguments to delve and forwards to the underlying binary. In order to use this version, you can set `--build-arg BUILD_VARIANT=debug` and it will pick up this version of the image. The default is `release`. The debug variant is only available for linux and the variant is ignored for any other target os. Most other targets don't support `buildkitd` at all so the only os this affects is freebsd. delve is exposed on port 5000 by default and this can be accessed from the host by using `-p 5000:5000`. If there is a port conflict on the host, `-p XXXX:5000` can be used instead. It's also highly recommended that you do `-p 127.0.0.1:5000:5000` instead. This is because docker defaults to exposing ports to any interface which exposes the debug port to the open internet. This is generally a good practice for running buildkit on a tcp address anyway and the same applies to delve. Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>