The rest of our workflows use v2.1.4.
For reasons I do not understand, we must set GOPATH here.
Maybe the GitHub Action builds come with GOPATH already set?
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
In a56520c3c7 dependabot attempted to bump
the setup-go action version. It appears to work for most builders, but
not the self-hosted VM builder. Revert for now.
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>