test: disable prevent_overlapping_partitions during test

During test, we are starting and stopping a ton of nodes and it's
getting a little wild and OTP is rightfully trying to help, but since
we're in test, and those nodes are not going to try to talk to each
other, it's more of a hindurance.

.dialyzer_ignore.exs

@@ -1,3 +1,4 @@
 [
-  {"lib/next_ls/lsp_supervisor.ex", :exact_eq}
+  {"lib/next_ls/lsp_supervisor.ex", :exact_eq},
+  {"lib/next_ls/runtime.ex", :exact_eq}
 ]

.github/workflows/ci.yaml

@@ -44,7 +44,7 @@ jobs:
         run: rm -rf tmp
 
       - name: Run Tests
-        run: mix test
+        run: elixir --erl '-kernel prevent_overlapping_partitions false' -S mix test
 
   formatter:
     runs-on: ubuntu-latest

lib/next_ls/runtime.ex

@@ -2,6 +2,8 @@ defmodule NextLS.Runtime do
   @moduledoc false
   use GenServer
 
+  @env Mix.env()
+
   def start_link(opts) do
     GenServer.start_link(__MODULE__, opts)
   end
@@ -91,18 +93,24 @@ defmodule NextLS.Runtime do
               {~c"RELEASE_SYS_CONFIG", false},
               {~c"PATH", String.to_charlist(new_path)}
             ],
-            args: [
-              System.find_executable("elixir"),
-              "--no-halt",
-              "--sname",
-              sname,
-              "--cookie",
-              Node.get_cookie(),
-              "-S",
-              "mix",
-              "loadpaths",
-              "--no-compile"
-            ]
+            args:
+              [System.find_executable("elixir")] ++
+                if @env == :test do
+                  ["--erl", "-kernel prevent_overlapping_partitions false"]
+                else
+                  []
+                end ++
+                [
+                  "--no-halt",
+                  "--sname",
+                  sname,
+                  "--cookie",
+                  Node.get_cookie(),
+                  "-S",
+                  "mix",
+                  "loadpaths",
+                  "--no-compile"
+                ]
           ]
         )