Add script/release for future rubygems release

Author: rick

script/release

@@ -0,0 +1,40 @@
+#!/bin/bash
+# Tag and push a release.
+
+set -e
+set -x
+
+# Make sure we're in the project root.
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
+cd ${DIR}
+
+# Build a new gem archive.
+
+rm -rf entitlements-github-plugin-*.gem
+gem build -q entitlements-github-plugin.gemspec
+
+# Make sure we're on the main branch.
+
+(git branch --no-color | grep -q '* main') || {
+  echo "Only release from the main branch."
+  exit 1
+}
+
+# Figure out what version we're releasing.
+
+tag=v`ls entitlements-github-plugin-*.gem | sed 's/^entitlements-github-plugin-\(.*\)\.gem$/\1/'`
+
+# Make sure we haven't released this version before.
+
+git fetch -t origin
+
+(git tag -l | grep -q "$tag") && {
+  echo "Whoops, there's already a '${tag}' tag."
+  exit 1
+}
+
+# Tag it and bag it.
+
+gem push entitlements-github-plugin-*.gem && git tag "$tag" &&
+  git push origin main && git push origin "$tag"