./script/trigger-release (#10589)

Add `./script/trigger-release {nightly|stable|preview}`

This command can be run regardless of the state of your local git
repository, and it
either triggers a workflow run of `bump_patch_version.yml` (for
stable/preview) or
it force pushes the nightly tag.

Also add some docs on releases to explain all of this.

Release Notes:

- N/A

script/bump-nightly

@@ -2,12 +2,6 @@
 
 set -e
 
-branch=$(git rev-parse --abbrev-ref HEAD)
-if [ "$branch" != "main" ]; then
-  echo "You must be on main to run this script"
-  exit 1
-fi
-
-git pull --ff-only origin main
-git tag -f nightly
+git fetch origin main:tags/nightly -f
+git log --oneline -1 nightly
 git push -f origin nightly