Bundler does some cool git stuff when publishing a package[1]. Conceptually, with cargo commands instead, and with error handling and rollback elided, it does this:

$ cargo build
$ git diff --exit-code == 0
$ git diff-index --quiet --cached HEAD == 0
$ git tag -a -m \"Version #{version}\" #{version_tag} 
$ git push
$ git push --tags
$ cargo publish

(version is like 1.2.3 and version_tag is like v1.2.3)

Having the tags automatically created at the same commit as was released, plus ensuring that what's on github/whatever is the same as what's on crates.io would be pretty great.

1: https://github.com/bundler/bundler/blob/master/lib/bundler/gem_helper.rb#L47-L50