Remove FARSIDE_NO_ROUTER env var

The FARSIDE_NO_ROUTER variable wasn't terribly useful after refactoring
the app to include the update routine internally (rather than available
externally as an elixir script).

Now the only supported environment variable is FARSIDE_TEST, which is
still useful for tests and quick validation of functionality.

lib/farside/application.ex

@@ -7,25 +7,19 @@ defmodule Farside.Application do
 
   @impl true
   def start(_type, _args) do
-    plug_children =
-      (System.get_env("FARSIDE_NO_ROUTER") && []) ||
-        [
-          Plug.Cowboy.child_spec(
-            scheme: :http,
-            plug: Farside.Router,
-            options: [
-              port: @farside_port
-            ]
-          ),
-          {PlugAttack.Storage.Ets, name: Farside.Throttle.Storage, clean_period: 60_000}
+    children = [
+      Plug.Cowboy.child_spec(
+        scheme: :http,
+        plug: Farside.Router,
+        options: [
+          port: @farside_port
         ]
-
-    children =
-      [
-        {Redix, {@redis_conn, [name: :redix]}},
-        Farside.Scheduler,
-        Farside.Server
-      ] ++ plug_children
+      ),
+      {PlugAttack.Storage.Ets, name: Farside.Throttle.Storage, clean_period: 60_000},
+      {Redix, {@redis_conn, [name: :redix]}},
+      Farside.Scheduler,
+      Farside.Server
+    ]
 
     opts = [strategy: :one_for_one, name: Farside.Supervisor]
     Supervisor.start_link(children, opts)

lib/farside/instances.ex

@@ -45,7 +45,8 @@ defmodule Farside.Instances do
 
       result =
         Enum.filter(service.instances, fn instance_url ->
-          request_url = instance_url <>
+          request_url =
+            instance_url <>
               EEx.eval_string(
                 service.test_url,
                 query: Enum.random(@queries)