fix: use new/0 to prevent compilation race condition (#89)

Author: magnetised

lib/phoenix/sync/electric.ex

@@ -296,7 +296,7 @@ defmodule Phoenix.Sync.Electric do
 
     if Phoenix.Sync.sandbox_enabled?() do
       defp plug_opts(_env, :sandbox, _electric_opts) do
-        %Phoenix.Sync.Sandbox.APIAdapter{}
+        Phoenix.Sync.Sandbox.APIAdapter.new()
       end
     else
       defp plug_opts(_env, :sandbox, _electric_opts) do

lib/phoenix/sync/sandbox/api_adapter.ex

@@ -6,6 +6,8 @@ if Phoenix.Sync.sandbox_enabled?() do
 
     alias Phoenix.Sync.Adapter.PlugApi
 
+    def new, do: %__MODULE__{}
+
     defimpl Phoenix.Sync.Adapter.PlugApi do
       def predefined_shape(adapter, shape) do
         {:ok, %{adapter | shape: shape}}