Suggestions for setting up a Go project
dave.cheney.net
dave.cheney.net
It may have support for a "go-import" file that you speak of, but it definitely has hard-coded knowledge of some popular vcs sites.
Also, GitHub does not include the meta tag on all pages where 'go get' would expect to find the meta tag. For example, the tag is not on the page https://github.com/golang/lint/golint?go-get=1.