buildx: install release binaries from a fork

[nicks]

adds a new API method that uses the github releases API to find the appropriate version to download.

[nicks]

loosely based on nicks/setup-buildx-action@e277290

The old approach always built from scratch, which added about 2 minutes to the CI pipeline. The new approach takes 30s (from cold cache) or 2s (if the tool is cached).

[crazy-max]

loosely based on nicks/setup-buildx-action@e277290

The old approach always built from scratch, which added about 2 minutes to the CI pipeline. The new approach takes 30s (from cold cache) or 2s (if the tool is cached).

If the idea is to be able to download from GitHub releases, let's just detect if a GH release-like URL is set in version like https://github.com/crazy-max/buildx/releases/tag/v0.10.4%2Blocalstate2 and avoid using a Git-like URL that can be confusing.

This way we would not need an extra installReleaseFromFork method but just check in download if version is GH release URL:

actions-toolkit/src/buildx/install.ts

Line 46 in ca519e1

const release: GitHubRelease = await Install.getRelease(version);

[nicks]

thanks @crazy-max ! I cut a new version of this PR based on your comments. After this PR:

• the download() function can download binaries from private forks
• the download() codepath uses the github api to fetch release. we no longer read from buildx-releases.json

PTAL?

This will also require some changes downstream to make this work (right now, setup-buildx-action doesn't even go down the download() code path if it sees a URL)

[nicks]

I'm going to back this change out for now. The hosted tool cache is a good stop gap. We'll revisit it if we need it!