Add cargo deny config and audit workflow

[gierens]

This adds the config file for cargo deny which automatically checks for things like advisories, licenses, bans, ... and a corresponding audit workflow that runs on every push changing dependencies and every night.

Signed-off-by: Sandro-Alessio Gierens [email protected]

[gierens]

@dtantsur The functional tests are failing because the setup-rust action just vanished from Github. #157 tries to replace it with an alternative.

[dtantsur]

#157 merged, could you rebase all your PRs?

[gierens]

@dtantsur I rebased it.

[dtantsur]

Wow, interesting, I did not know about cargo-deny. TIL! https://github.com/dtantsur/rust-openstack/actions/runs/8679800639/job/23799281981?pr=156 shows a lot of deprecation warnings, could you check if any of these are important?

[gierens]

I updated the deny.toml according to the new template, the deprecation warnings are gone now.

[gierens]

The failing functional test on zed seems to be unrelated.