add devcontainer setup

Author: Colby Swandale

.devcontainer/Dockerfile

@@ -0,0 +1,4 @@
+ARG RUBY_VERSION=3.4.4
+FROM ghcr.io/rails/devcontainer/images/ruby:$RUBY_VERSION
+
+ENV BINDING="0.0.0.0"

.devcontainer/devcontainer.json

@@ -0,0 +1,16 @@
+{
+  "name: RubyGems Guides",
+  "dockerFile": "Dockerfile",
+  "forwardPorts": [
+    4000
+  ],
+  "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+  "postCreateCommand": "bin/setup",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "Shopify.ruby-lsp"
+      ]
+    }
+  }
+}

bin/jekyll

@@ -0,0 +1,27 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'jekyll' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
+
+bundle_binstub = File.expand_path("bundle", __dir__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300).include?("This file was generated by Bundler")
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("jekyll", "jekyll")

bin/setup

@@ -0,0 +1,14 @@
+#!/usr/bin/env ruby
+
+require "fileutils"
+
+APP_ROOT = File.expand_path("..", __dir__)
+
+def system!(*args)
+  system(*args, exception: true)
+end
+
+FileUtils.chdir APP_ROOT do
+  puts "=== Installing dependencies ==="
+  system("bundle check") || system!("bundle install")
+end