Add flake.nix

[manveru]

Content

This PR includes the flake.nix and flake.lock files, enabling easy building using nix for the mithril-client, mithril-signer, and mithril-aggregator packages.

It also adds a minimal devShell for cargo and rustc, as well as setup for formatting using the standard nix fmt or treefmt commands.

Pre-submit checklist

• Branch
  • Tests are provided (if possible)
  • Crates versions are updated (if relevant)
  • Commit sequence broadly makes sense
  • Key commits have useful messages
• PR
  • No clippy warnings in the CI
  • Self-reviewed the diff
  • Useful pull request description
  • Reviewer requested
• Documentation
  • Update README file (if relevant)
  • Update documentation website (if relevant)
  • Add dev blog post (if relevant)

Comments

Once merged, they can be used with nix build or nix run under the following flake URLs:

• github:input-output-hk/mithril#mithril-client
• github:input-output-hk/mithril#mithril-signer
• github:input-output-hk/mithril#mithril-aggregator

[github-actions]

Test Results

    3 files  ±0    30 suites  ±0   6m 19s ⏱️ +33s
470 tests ±0  470 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
540 runs  ±0  540 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 4a7a11c. ± Comparison against base commit bcad6b1.

♻️ This comment has been updated with latest results.

[jpraynaud]

LGTM 👍