aa_sev_kbc.yml workflow fails

[mythi]

Describe the bug

aa_sev_kbc.yml is set to trigger only when changes to the corresponding KBC files are made but not when, e.g. changes to cargo dependencies are made.

I can see two problems:

• get offline_sev_kbc build fixed
• rework/update aa_sev_kbc.yml so that it is actually run more often

How to reproduce

$ cargo build -p kbc --no-default-features --features offline_sev_kbc,rust-crypto

CoCo version information

guest-components HEAD

What TEE are you seeing the problem on

Sev

Failing command and relevant log output

error[E0432]: unresolved import `sev`
 --> attestation-agent/kbc/src/offline_sev_kbc/mod.rs:9:5
  |
9 | use sev::*;
  |     ^^^ use of undeclared crate or module `sev`

For more information about this error, try `rustc --explain E0432`.
error: could not compile `kbc` (lib) due to 1 previous error

[Xynnn007]

@fitzthum Is offline sev kbc still used?