squash layers by default

[komuw]

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Now,

What(What have you changed/added/removed?)

Why(Why did you change/add/remove it?)

[komuw]

circleCI still doesn't support it

docker volume: meli_data-volume created successfully.

	 service=buildservice error=originalErr:: originalErr:: Error response from daemon: squash is only supported with experimental mode 
ThisErr::  :unable to build docker image 
ThisErr:: %!s(<nil>)
	 service=backup error=originalErr:: originalErr:: Error response from daemon: squash is only supported with experimental mode 
ThisErr::  :unable to build docker image 
ThisErr:: %!s(<nil>)
	 service=nestedservice error=originalErr:: originalErr:: Error response from daemon: squash is only supported with experimental mode 
ThisErr::  :unable to build docker image 
ThisErr:: %!s(<nil>)
	 service=onbuildcopy error=originalErr:: originalErr:: Error response from daemon: squash is only supported with experimental mode 
ThisErr::  :unable to build docker image 
ThisErr:: %!s(<nil>)
	 service=build_with_no_specified_dockerfile error=originalErr:: originalErr:: Error response from daemon: squash is only supported with experimental mode 
ThisErr::  :unable to build docker image