./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/trigger-release

@@ -0,0 +1,15 @@
+#!/bin/bash
+set -euo pipefail
+
+which gh >/dev/null || brew install gh
+
+if [ "$1" == "nightly" ]; then
+  ./script/bump-nightly
+  exit
+fi
+
+version=$(./script/get-released-version "$1" | sed 's/\.[^\.]*$/.x/')
+echo "Bumping $1 (v$version)"
+
+gh workflow run "bump_patch_version.yml" -f branch="v$version"
+echo "Follow along at: https://github.com/zed-industries/zed/actions"