tests: add Radicle native CI file to run CI on collaborating nodes — radicle-ci-broker

Signed-off-by: Lars Wirzenius liw@liw.fi

 shell: |
   cargo --version
   rustc --version
   cargo fmt --check
   cargo clippy --all-targets --workspace -- --deny clippy::all
   cargo build --all-targets --workspace
   cargo doc --workspace
   cargo test --workspace --no-fail-fast