Statically link librarys when building to fix OpenSSL

[veloii]

This is required for OpenSSL to work properly when building on Alpine, otherwise a segmentation fault will occur.

sfackler/rust-openssl#1462
est31/cargo-udeps#89

It seems the solution to this issue is to add RUSTFLAGS="-C target-feature=-crt-static". Another solution would be allowing the user to set their own RUSTFLAGS however I'm not experienced enough with bash and github actions to create and test it.

This would also fix #66 and #49.

[Douile]

Thanks for looking into this!

You should be able to set environment variables with the env job property, the scripts don't override this variable so setting RUSTFLAGS here should work.

I'm not sure static linking is the best default configuration, it would be better to add an easy flag to enable static linking e.g.

with:
  static-linking: true

[veloii]

Yeah I agree, it should probably also be noted in the README.md as it would be very helpful as it took me a couple hours to figure out the issue. I'm not really good with bash or docker so I wouldn't be able to implement this in this pr.

[Douile]

My mistake, I had forgotten the default for rust: when building for the musl target (the actions default) static linking is enabled by default 1. What the option you provided is actually doing is disabling static linking 1. That being said if it fixes issues it is a good option to have, but I wanted you to be aware that you are producing a dynamically linked library not a statically linked one.