Add support for git dependencies in gleam packages

Author: Rodrigo Álvarez

lib/mix/lib/mix/gleam.ex

@@ -36,8 +36,17 @@ defmodule Mix.Gleam do
 
     spec =
       case requirement do
-        %{"version" => version} -> {dep, version, opts}
-        %{"path" => path} -> {dep, Keyword.merge(opts, path: path)}
+        %{"version" => version} ->
+          {dep, version, opts}
+
+        %{"path" => path} ->
+          {dep, Keyword.merge(opts, path: path)}
+
+        %{"git" => git, "ref" => ref} ->
+          {dep, git: git, ref: ref}
+
+        _ ->
+          Mix.raise("Gleam package #{dep} has unsupported requirement: #{inspect(requirement)}")
       end
 
     case spec do

lib/mix/test/mix/gleam_test.exs

@@ -44,6 +44,7 @@ defmodule Mix.GleamTest do
           "version" => "1.0.0",
           "gleam" => ">= 1.8.0",
           "dependencies" => %{
+            "git_dep" => %{"git" => "../git_dep", "ref" => "957b83b"},
             "gleam_stdlib" => %{"version" => ">= 0.18.0 and < 2.0.0"},
             "my_other_project" => %{"path" => "../my_other_project"}
           },
@@ -56,6 +57,7 @@ defmodule Mix.GleamTest do
                version: "1.0.0",
                gleam: ">= 1.8.0",
                deps: [
+                 {:git_dep, git: "../git_dep", ref: "957b83b"},
                  {:gleam_stdlib, ">= 0.18.0 and < 2.0.0"},
                  {:my_other_project, path: "../my_other_project"},
                  {:gleeunit, ">= 1.0.0 and < 2.0.0", only: :dev}