Disable signal trap for usage kemal with outher tools

spec/config_spec.cr

@@ -40,6 +40,14 @@ describe "Config" do
     config.shutdown_message.should eq true
   end
 
+  it "toggles the disable trap signal" do
+    config = Kemal.config
+    config.disable_trap_signal = false
+    config.disable_trap_signal.should eq false
+    config.disable_trap_signal = true
+    config.disable_trap_signal.should eq true
+  end
+
   it "adds custom options" do
     config = Kemal.config
     ARGV.push("--test")

src/kemal.cr

@@ -89,6 +89,8 @@ module Kemal
   end
 
   private def self.setup_trap_signal
+    return if Kemal.config.disable_trap_signal
+
     Signal::INT.trap do
       log "#{Kemal.config.app_name} is going to take a rest!" if Kemal.config.shutdown_message
       Kemal.stop

src/kemal/config.cr

@@ -21,7 +21,7 @@ module Kemal
     {% end %}
 
     property host_binding, ssl, port, env, public_folder, logging, running
-    property always_rescue, server : HTTP::Server?, extra_options, shutdown_message
+    property always_rescue, server : HTTP::Server?, extra_options, shutdown_message, disable_trap_signal
     property serve_static : (Bool | Hash(String, Bool))
     property static_headers : (HTTP::Server::Response, String, File::Info -> Void)?
     property powered_by_header : Bool = true, app_name
@@ -41,6 +41,7 @@ module Kemal
       @default_handlers_setup = false
       @running = false
       @shutdown_message = true
+      @disable_trap_signal = false
       @handler_position = 0
     end
 
@@ -61,6 +62,7 @@ module Kemal
       @router_included = false
       @handler_position = 0
       @default_handlers_setup = false
+      @disable_trap_signal = false
       HANDLERS.clear
       CUSTOM_HANDLERS.clear
       FILTER_HANDLERS.clear