Find and apply the MSRV, `rust-version = "1.78.0"` to the
`radicle-git` crates.
While applying this change, use the workspace values to clean up
repetition.
Add the Nix flake machinery for developing using Nix tooling.
This requires that the following are added:
- Cargo.lock
- rust-toolchain
To ensure that versions are pinned.
Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett