Check for KEMAL_ENV variable already in Config#initialize (#552)

src/kemal/cli.cr

@@ -8,7 +8,6 @@ module Kemal
       @key_file = ""
       @cert_file = ""
       @config = Kemal.config
-      read_env
       if args
         parse args
       end
@@ -52,11 +51,5 @@ module Kemal
         end
       {% end %}
     end
-
-    private def read_env
-      if kemal_env = ENV["KEMAL_ENV"]?
-        @config.env = kemal_env
-      end
-    end
   end
 end

src/kemal/config.cr

@@ -29,7 +29,7 @@ module Kemal
     def initialize
       @host_binding = "0.0.0.0"
       @port = 3000
-      @env = "development"
+      @env = ENV["KEMAL_ENV"]? || "development"
       @serve_static = {"dir_listing" => false, "gzip" => true}
       @public_folder = "./public"
       @logging = true