Publish from GitHub Action and add release script

.github/workflows/release.yml

@@ -0,0 +1,28 @@
+name: Release
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+  release:
+    types:
+      - published
+
+jobs:
+  push:
+    if: github.event_name == 'release' && github.event.action == 'published'
+    runs-on: ubuntu-latest
+    environment: release
+    permissions:
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          ruby-version: ruby
+
+      - uses: rubygems/release-gem@v1

Rakefile

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require 'bundler/gem_tasks'
 require 'rake/testtask'
 require 'rubocop/rake_task'
 

dev-bin/release.sh

@@ -0,0 +1,59 @@
+#!/bin/bash
+
+set -eu -o pipefail
+
+changelog=$(cat CHANGELOG.md)
+
+regex='
+## v([0-9]+\.[0-9]+\.[0-9]+) \(([0-9]{4}-[0-9]{2}-[0-9]{2})\)
+
+((.|
+)*)
+'
+
+if [[ ! $changelog =~ $regex ]]; then
+      echo "Could not find date line in change log!"
+      exit 1
+fi
+
+version="${BASH_REMATCH[1]}"
+date="${BASH_REMATCH[2]}"
+notes="$(echo "${BASH_REMATCH[3]}" | sed -n -E '/^## v[0-9]+\.[0-9]+\.[0-9]+/,$!p')"
+
+echo "$notes"
+if [[ "$date" != "$(date +"%Y-%m-%d")" ]]; then
+    echo "$date is not today!"
+    exit 1
+fi
+
+tag="v$version"
+
+if [ -n "$(git status --porcelain)" ]; then
+    echo ". is not clean." >&2
+    exit 1
+fi
+
+perl -pi -e "s/(?<=s.version\s{,20}=\s{,20}\').+?(?=\')/$version/g" maxmind-db.gemspec
+
+echo $"Test results:"
+
+rake
+
+echo $'\nDiff:'
+git diff
+
+echo $'\nRelease notes:'
+echo "$notes"
+
+read -e -p "Commit changes and push to origin? " should_push
+
+if [ "$should_push" != "y" ]; then
+    echo "Aborting"
+    exit 1
+fi
+
+git commit -m "Update for $tag" -a
+
+git push
+
+gh release create --target "$(git branch --show-current)" -t "$version" -n "$notes" "$tag"