Right now we publish the CHANGELOG.md file from the tip of m-c. This is not accurate as we (sigh) sometimes uplift API changes to the beta branch.

One way to fix that would be to have a versioned CURRENT.md changelog file that gets rolled every time we branch off, and then we can update the publish script to link all CURRENT.md files from the branches that we care about (most likely: release, beta and central).

changelog/CURRENT.md // changes happen here
changelog/v68.md // old CURRENT.md gets copied here after branch cut
changelog/v67.md
// ...

A script uploads changelog to https://geckoview.dev.

Tasks should have severity N/A.