support new gleam build CLI that doesn't accept legacy dot argument

lib/mix/tasks/compiler/gleam.ex

@@ -1,10 +1,26 @@
 defmodule Mix.Tasks.Compile.Gleam do
   use Mix.Task.Compiler
 
+  @first_gleam_version_not_taking_build_arg "0.18.0-rc1"
+
   def run(_args) do
-    case Mix.shell().cmd("gleam build .") do
+    case Mix.shell().cmd(build_command()) do
       0 -> {:ok, []}
       status -> exit(status)
     end
   end
+
+  defp build_command do
+    if build_needs_arg?(),
+      do: "gleam build .",
+      else: "gleam build"
+  end
+
+  defp build_needs_arg? do
+    {cmd_output, 0} = System.cmd("gleam", ["-V"])
+    <<"gleam "::utf8, active_version::binary>> = String.trim(cmd_output)
+
+    comparison = Version.compare(active_version, @first_gleam_version_not_taking_build_arg)
+    comparison == :lt
+  end
 end