docker_build.sh: Run container in interactive mode (#5088)

* docker_build.sh: Run container in interactive mode

* Add message about QMK Toolbox

* Update Docker docs

util/docker_build.sh

@@ -39,11 +39,12 @@ if [ -n "$target" ]; then
 	else
 		echo "Error: target requires docker-machine to work on your platform" >&2
 		echo "See http://gw.tnode.com/docker/docker-machine-with-usb-support-on-windows-macos" >&2
+		echo "Consider flashing with QMK Toolbox (https://github.com/qmk/qmk_toolbox) instead" >&2
 		exit 3
 	fi
 fi
 dir=$(pwd -W 2>/dev/null) || dir=$PWD  # Use Windows path if on Windows
 
 # Run container and build firmware
-docker run --rm $usb_args -v "$dir":/qmk_firmware qmkfm/qmk_firmware \
+docker run --rm -it $usb_args -v "$dir":/qmk_firmware qmkfm/qmk_firmware \
 	make "$keyboard${keymap:+:$keymap}${target:+:$target}"