Add dialyzer to pre-commit hooks

mix.exs

@@ -11,7 +11,8 @@ defmodule BirdyChat.MixProject do
       aliases: aliases(),
       deps: deps(),
       compilers: [:phoenix_live_view] ++ Mix.compilers(),
-      listeners: [Phoenix.CodeReloader]
+      listeners: [Phoenix.CodeReloader],
+      dialyzer: [plt_add_apps: [:ex_unit]]
     ]
   end
 
@@ -91,6 +92,7 @@ defmodule BirdyChat.MixProject do
         "compile --warnings-as-errors",
         "credo --strict",
         "deps.unlock --unused",
+        "dialyzer",
         "format",
         "test"
       ]