feat(linux) add curl

[dduportal]

This PR fixes #153 but is blocked by #320 .

It adds curl on all the Linux images + the root CA certificates (to ensure any HTTPS website can be used with curl).

It also stop using curl to download the remoting: the Dockerfile directive ADD is used instead to benefit from BuildX optimization, benefit from improved caching and simplify instructions (less layers, less code and faster builds).
Please note that the ADD instruction will soon support checksum https://docs.docker.com/engine/reference/builder/#verifying-a-remote-file-checksum-add---checksumchecksum-http-src-dest.

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