add certmanager

packages/certmanager.nix

@@ -0,0 +1,29 @@
+with import <nixpkgs> {};
+
+stdenv.mkDerivation rec {
+  name = "cert-manager";
+  version = "v1.7.1";
+  src = fetchurl {
+    url = "https://github.com/cert-manager/cert-manager/releases/download/${version}/cmctl-linux-amd64.tar.gz";
+    sha256 = "1z5n2rcfhrl1vm5vxqa1759m3prlv08mmg96n16p4gwkdxycznx4";
+  };
+
+  nativeBuildInputs = [
+    autoPatchelfHook
+  ];
+
+  unpackPhase = ''
+    tar xvpzf $src
+  '';
+
+  installPhase = ''
+    install -m 755 -D cmctl $out/bin/cmctl
+  '';
+
+  meta = with lib; {
+    homepage = "https://cert-manager.io";
+    description = "cert-manager CLI";
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ foosinn ];
+  };
+}

roles/admin.nix

@@ -25,6 +25,7 @@ in {
 
     (import ../packages/skaffold.nix)
     (import ../packages/helm2.nix)
+    (import ../packages/certmanager.nix)
   ];
 
   virtualisation.docker = {