[bells17]

Before this PR

The release distribution only ships Linux binaries (linux-amd64, linux-arm64).
Each release asset (policy-bot-<version>.tgz) contains:

policy-bot-<version>/
  bin/
    linux-amd64/policy-bot
    linux-arm64/policy-bot

Because of this, macOS users who want to run helper commands such as
policy-bot validate locally have no prebuilt binary to download. It can still
be installed via go install, but that requires a Go toolchain and a local
build. Having a prebuilt binary available for download is much more convenient.

After this PR

==COMMIT_MSG==
Add darwin (macOS) binaries to the release distribution.

darwin/amd64 and darwin/arm64 are added to the os-archs list in
godel/config/dist-plugin.yml, so ./godelw dist now also produces macOS
binaries and they are bundled into the same release .tgz:

policy-bot-<version>/
  bin/
    linux-amd64/policy-bot
    linux-arm64/policy-bot
    darwin-amd64/policy-bot   # new (Intel Mac)
    darwin-arm64/policy-bot   # new (Apple Silicon)

macOS users can now download the release archive and use the prebuilt binary
(e.g. for policy-bot validate) without needing a Go toolchain.
==COMMIT_MSG==

Possible downsides?

• None for existing users. The release archive layout is unchanged; only two
  additional bin/<os>-<arch>/ directories are added.
• The release archive becomes slightly larger due to the two extra binaries.
• The binaries are built with CGO_ENABLED=0 (matching the existing Linux
  builds), so they cross-compile cleanly and require no new build dependencies.
  The Docker image is unaffected since its Dockerfile explicitly references
  bin/linux-amd64/policy-bot.

[palantirtech]

Thanks for your interest in palantir/policy-bot, @bells17! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

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Description

Add darwin (macOS) binaries to the release distribution.

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💡 Improvements

• Add darwin (macOS) binaries to the release distribution. (#1255)

[asvoboda]

Thanks!