Initial homebrew support (fix #9)

contrib/homebrew/docker-machine-driver-scaleway.rb

@@ -0,0 +1,28 @@
+require "language/go"
+
+class DockerMachineDriverScaleway < Formula
+  desc "Docker Machine driver for Scaleway"
+  homepage "https://github.com/scaleway/docker-machine-driver-scaleway/"
+  url "https://github.com/scaleway/docker-machine-driver-scaleway/archive/v1.0.0.tar.gz"
+  sha256 "ca8b2551a2cbf871cb9111ae6a991b5a4a207b4330033ca495f75642729c4c1d"
+
+  head "https://github.com/scaleway/docker-machine-driver-scaleway.git"
+
+  depends_on "go" => :build
+  depends_on "docker-machine" => :recommended
+
+  def install
+    ENV["GOPATH"] = buildpath
+    path = buildpath/"src/github.com/scaleway/docker-machine-driver-scaleway"
+    path.install Dir["{*,.git,.gitignore}"]
+
+    cd path do
+      system "go", "build", "-o", "#{bin}/docker-machine-driver-scaleway", "./main.go"
+    end
+  end
+
+  test do
+    output = shell_output("#{Formula["docker-machine"].bin}/docker-machine create --driver scaleway -h")
+    assert_match "scaleway-name", output
+  end
+end