mastodon: init at 3.3.0

Co-authored-by: Happy River <happyriver93@runbox.com>
Co-authored-by: Justin Humm <justin.humm@posteo.de>
Co-authored-by: Alyssa Ross <hi@alyssa.is>
Co-authored-by: adisbladis <adisbladis@gmail.com>

pkgs/servers/mastodon/update.nix

@@ -0,0 +1,21 @@
+{ pkgs, stdenv, lib, makeWrapper, yarn2nix, bundix, coreutils,
+  diffutils, nix-prefetch-github, gnused, jq }:
+stdenv.mkDerivation rec {
+  name = "mastodon-update-script";
+  installPhase = ''
+    mkdir -p $out/bin
+    cp ${./update.sh} $out/bin/update.sh
+    patchShebangs $out/bin/update.sh
+    wrapProgram $out/bin/update.sh --prefix PATH : ${lib.makeBinPath buildInputs}
+  '';
+  phases = [ "installPhase" ];
+
+  nativeBuildInputs = [ makeWrapper ];
+  buildInputs = [ yarn2nix bundix coreutils diffutils nix-prefetch-github gnused jq ];
+
+  meta = {
+    maintainers = with lib.maintainers; [ happy-river ];
+    description = "Utility to generate Nix expressions for Mastodon's dependencies";
+    platforms = lib.platforms.unix;
+  };
+}