Secure boot support

[LucasGGamerM]

Distribution (run cat /etc/os-release):
NAME="Pop!_OS"
VERSION="22.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 22.04 LTS"
VERSION_ID="22.04"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=jammy
UBUNTU_CODENAME=jammy
LOGO=distributor-logo-pop-os

Related Application and/or Package Version (run apt policy $PACKAGE NAME):

Issue/Bug Description:
No secure boot support on nvidia (I haven't tested on the other installation flavor, so I don't know if the same applies there)

Steps to reproduce (if you know):
Enable secure boot;
Try to boot;
See failed boot attempt due to secure boot not being supported by PopOS

Expected behavior:
Boots normally.

Other Notes:
None.