Add integration for release automation

Add just recipes to prepare releases of workspace members and tag them. Add just recipe to be called in CI, which is used in a tag pipeline, ensures that the metadata matches the tag and then publishes the crate in question on crates.io.

Only downside to this approach is, that this will not work for new crates in the workspace, as they have to be created and setup on the crates.io side first.

cc @gromit @klausenbusk (the relevant user is invited to the two crates in question: nethsm and nethsm-cli)