helmfile 0.21.0 (new formula)

Closes #28436.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

Formula/helmfile.rb

@@ -0,0 +1,30 @@
+class Helmfile < Formula
+  desc "Deploy Kubernetes Helm Charts"
+  homepage "https://github.com/roboll/helmfile"
+  url "https://github.com/roboll/helmfile/archive/v0.21.0.tar.gz"
+  sha256 "75503bd10fbff95fa5c4d84ef2aff8f62774eeec2d5a73d1025271883cd330f2"
+
+  depends_on "go" => :build
+  depends_on "kubernetes-helm"
+
+  def install
+    ENV["GOPATH"] = buildpath
+    (buildpath/"src/github.com/roboll/helmfile").install buildpath.children
+    cd "src/github.com/roboll/helmfile" do
+      system "go", "build", "-ldflags", "-X main.Version=v#{version}",
+             "-o", bin/"helmfile", "-v", "github.com/roboll/helmfile"
+      prefix.install_metafiles
+    end
+  end
+
+  test do
+    (testpath/"helmfile.yaml").write <<-EOS
+      repositories:
+      - name: stable
+        url: https://kubernetes-charts.storage.googleapis.com/
+    EOS
+    system Formula["kubernetes-helm"].opt_bin/"helm", "init", "--client-only"
+    output = '"stable" has been added to your repositories'
+    assert_match output, shell_output("#{bin}/helmfile -f helmfile.yaml repos")
+  end
+end