command that tags the most recently published version to npm as "legacy"

[bcoe]

For the Node.js version support policy I'm drafting, we need a command that creates a legacy dist-tag, based on the most recently published version of all of our libraries.

We would run this command immediately before dropping support for an EOL version of Node.js.

[JustinBeckwith]

Do we need to add a new command here? For most things you'd do on the cmdline, you can follow the pattern:

repo sync
repo exec -- git some-command do-stuff
repo exec -- git push origin blergh

[bcoe]

@JustinBeckwith the annoying thing is you need to pass the package version to npm dist-tag add, so I think it would be nice to have a script that parses the package.json, takes the most recently published version, and generates the npm dist-tag add command.