Add ngrok package (#3212)

packages/ngrok.rb

+require 'package'
+
+class Ngrok < Package
+  description 'ngrok exposes local servers behind NATs and firewalls to the public internet over secure tunnels.'
+  homepage 'https://ngrok.com/'
+  version '2.3.15'
+  case ARCH
+  when 'aarch64'
+    source_url 'https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-arm.zip'
+    source_sha256 'd7c1beab61690cf83be3fc4e26880806e3c2ebbe6357182457f4cad22ae033de'
+  when 'armv7l'
+    source_url 'https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-arm.zip'
+    source_sha256 'd7c1beab61690cf83be3fc4e26880806e3c2ebbe6357182457f4cad22ae033de'
+  when 'i686'
+    source_url 'https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-386.zip'
+    source_sha256 'e8b8b033b4aec785e0ba1e5ce5893982fc9740aeb2006b1f9c2d2a906f5884f9'
+  when 'x86_64'
+    source_url 'https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zip'
+    source_sha256 '45d8a9e10abff1c77210acc0c123cdea3b7fbce7cfc1a06138c6392379775b17'
+  end
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  def self.install
+    system "install -Dm755 ngrok #{CREW_DEST_PREFIX}/bin/ngrok"
+  end
+end