Add build for linux-musl target

[ch1ffa]

This PR attempts to fix #3725 and #3739.

A new target x86_64-unknown-linux-musl has been added to ci.yml along with the additional musl-tools package (can be removed in the future when this issue is resolved) and the hyper-tls/vendored feature which allow to build openssl-sys package for the new target.

I ended up with building directly on GitHub Action VM without custom docker image because it allows to implement it just as a new target in matrix. Building in docker image requires a separated job.

detect-libc is using for detecting correct platform.

Compiled binary has been tested inside node:alpine image. I'm not sure how to test it in the Bazel Sandbox, maybe it is better to ask the issue author.

[alunyov]

Thank you @ch1ffa!

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[ch1ffa]

@alunyov by the way, here is another example how to detect a proper target. They even use musl as a default target for x64.