- the create-release-branch workflow works by getting the most recent
tag, bumping it and using that to create the new tag
- now we've moved Portal into the monorepo, we've got two different
types of flags, but the Portal ones aren't valid semver so the
workflow fails if the most recent tag is one for Portal
- this fixes that by ensuring we only fetch tags matching the pattern we
use for tagging Ghost
- we didn't clone the repo at the point when we were running a git
command, so that failed
- switched to a different method of checking out `main` and then
checking out the most recent tag
- right now, we use an internal CI solution to create branches for patch
releases, but it's difficult to use
- this workflow should allow the team to create release branches from
the GitHub UI, without delving into our internal tooling
