Publish on crates.io

[flxo]

Using Northstar is currently hard. No clean versioning and due to it's only available via git there's no way to mirror it safely with cargo registry or vendor.

a task list item

In order to publish the crate the following things need to be resolved:

• Replace the cgroups-rs git dependency with an release from crates.io. This is blocked by nix: #1690 because cgroups-rs build for Android is broken.
• Check the cargo manifests and extend with readme etc...
• Adjust versions to be the same across all crates in this workspace
• Rename crates - see below
• Decide which name to use. northstar is taken. See Start using SemVer 'pre-releases' #496
• Docker images shall be built from tag v.* instead of docker-*

crates

• northstar: Northstar main. Take the example main. Think about removing the android specials
• norhstar-runtime: Rename northstar to northstar-runtime
• northstar-nstar: Rename toos/nstar to norhtstar-nstar. TOOD Rename the binary to nstar or keep northstar-nstar and a shell alias does the trick for lazy people
• northstar-sextant Rename tools/sextant
• northstar-seccomp Rename tools/seccomp-util to northstar-seccomp