Github Actions release pipeline

[baconpaul]

After 1.3.3 I basically shut down the azure pipeline for surge and we are actions only

But the release side of the release-or-nightly action is untested

so test that one day and fix the bugs :)

[baconpaul]

Once this is sorted, update both the home-brew documentation and the release checklist template, and then open a 1.4.0 release checklist.

[baconpaul]

Include test without an xt docs dir in that new checklist