Adding preliminary macOS support

bin/codedeploy-launchd

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+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# Run the CodeDeploy agent in the foreground so that it
+# can be controlled by MacOS's launchd. This does away with
+# most of the Gli command-line handling stuff, since this has
+# only one way of being invoked (i.e. launchd).
+#
+# Mostly copied from the official CLI entrypoint in `lib/codedeploy-agent.rb`
+agent_dir = '/opt/aws/codedeploy'
+$LOAD_PATH.unshift "#{agent_dir}/lib"
+
+require 'instance_agent'
+
+# Always use the config file from the installation root:
+InstanceAgent::Config.config(
+  config_file: "#{agent_dir}/conf/codedeployagent.yml"
+)
+
+InstanceAgent::Platform.util = InstanceAgent::LinuxUtil
+InstanceAgent::Config.load_config
+
+# The `.new` here ensures that the master runs in the foreground instead of as
+# a daemon.
+InstanceAgent::Runner::Master.new.start

init.d/com.amazon.aws.codedeploy.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+  <dict>
+    <key>Label</key>
+    <string>com.amazon.aws.codedeploy</string>
+    <key>UserName</key>
+    <string>root</string>
+    <key>RunAtLoad</key>
+    <true/>
+    <key>ProgramArguments</key>
+    <array>
+      <string>/opt/aws/codedeploy/bin/codedeploy-launchd</string>
+    </array>
+    <key>KeepAlive</key>
+    <true/>
+  </dict>
+</plist>