[Enhancement] Improve Dockerfile permissions (#157)

* Updated dockerfile

* added a healthcheck

lib/pinchflat_web/controllers/health_controller.ex

@@ -0,0 +1,9 @@
+defmodule PinchflatWeb.HealthController do
+  use PinchflatWeb, :controller
+
+  def check(conn, _params) do
+    conn
+    |> put_status(:ok)
+    |> json(%{status: "ok"})
+  end
+end

lib/pinchflat_web/router.ex

@@ -47,6 +47,13 @@ defmodule PinchflatWeb.Router do
     get "/media/:uuid/stream", MediaItems.MediaItemController, :stream
   end
 
+  # No auth or CSRF protection for the health check endpoint
+  scope "/", PinchflatWeb do
+    pipe_through :api
+
+    get "/healthcheck", HealthController, :check
+  end
+
   scope "/dev" do
     pipe_through :browser