CI: Add riscv64gc-unknown-linux-gnu support to mk/.

[briansmith]

No description provided.

[codecov]

Codecov Report

Merging #1562 (80544a3) into main (450ada2) will increase coverage by 2.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1562      +/-   ##
==========================================
+ Coverage   90.09%   92.26%   +2.16%     
==========================================
  Files         121      127       +6     
  Lines       14259    18811    +4552     
  Branches      166      196      +30     
==========================================
+ Hits        12847    17356    +4509     
- Misses       1380     1420      +40     
- Partials       32       35       +3     

Impacted Files	Coverage Δ
src/aead/shift.rs	40.00% <0.00%> (-60.00%)	⬇️
src/aead/aes.rs	81.25% <0.00%> (-2.01%)	⬇️
src/aead/gcm/gcm_nohw.rs	0.00% <0.00%> (ø)
crypto/curve25519/internal.h	100.00% <0.00%> (ø)
crypto/fipsmodule/bn/internal.h	100.00% <0.00%> (ø)
crypto/fipsmodule/aes/aes_nohw.c	0.00% <0.00%> (ø)
crypto/poly1305/poly1305.c	96.74% <0.00%> (ø)
third_party/fiat/p256_32.h	100.00% <0.00%> (ø)
crypto/fipsmodule/ec/p256.c	99.60% <0.00%> (ø)
crypto/fipsmodule/ec/gfp_p256.c	100.00% <0.00%> (ø)
... and 18 more

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[MichaIng]

We are highly interested in this. Let me know if we can help, e.g. with testing on a physical riscv64 system.

[MichaIng]

I'm currently trying to compile vaultwarden on riscv64.

I can verify that ring compiles successfully on riscv64 with this minimal (compared to other open PRs) change in include/ring-core/base.h (excluding the CI part). But since the API changed in 0.17.0 so far (right?), other crates fail to work with it.

On 0.16.20, more changes are needed, which I'm currently trying to identify. Let me know whether there is some interest in a compatible 0.16.21 release with riscv64 support that has been tested with vaultwarden, if I'm able to succeed.

[briansmith]

This was done in PR #1627.