Add mutagen package (#4183)

packages/mutagen.rb

+require 'package'
+
+class Mutagen < Package
+  description 'Mutagen provides real-time file synchronization and flexible network forwarding, extending the reach of your existing development tools to cloud-based containers and infrastructure.'
+  homepage 'https://mutagen.io/'
+  version '0.11.5'
+  compatibility 'all'
+  case ARCH
+  when 'aarch64', 'armv7l'
+    source_url 'https://github.com/mutagen-io/mutagen/releases/download/v0.11.5/mutagen_linux_arm_v0.11.5.tar.gz'
+    source_sha256 '35ac96d59cd958aab6b2e693da2882df17a1714b2529f9c7210deb439bb59468'
+  when 'i686'
+    source_url 'https://github.com/mutagen-io/mutagen/releases/download/v0.11.5/mutagen_linux_386_v0.11.5.tar.gz'
+    source_sha256 'bf293258b96ca5c5a96c8e4787b101c4c287ce82a0bdf9038817385054718c61'
+  when 'x86_64'
+    source_url 'https://github.com/mutagen-io/mutagen/releases/download/v0.11.5/mutagen_linux_amd64_v0.11.5.tar.gz'
+    source_sha256 '00112216f7d259ab94f951d5b3c644fe40a040e042811439781fcae810314575'
+  end
+
+  def self.install
+    case ARCH
+    when 'aarch64', 'armv7l'
+      arch = 'arm'
+    when 'i686'
+      arch = '386'
+    when 'x86_64'
+      arch = 'amd64'
+    end
+    system "tar xvf mutagen-agents.tar.gz linux_#{arch}"
+    system "install -Dm755 mutagen #{CREW_DEST_PREFIX}/bin/mutagen"
+    system "install -Dm755 linux_#{arch} #{CREW_DEST_PREFIX}/bin/mutagen-agent"
+  end
+
+  def self.postinstall
+    puts
+    puts "Type 'mutagen' to get started.".lightblue
+    puts
+  end
+end