how to verify prebuit images

[dalb8]

Sorry if this isn’t the right forum; I would post in the XDA thread as mentioned here: https://lineage.microg.org but don’t see any link.

I would like to install lineage os for microg on my phone. I wonder why there is a way to verify the system image with the update_verifier.py script but no way to verify the recovery image.

Btw, am also wondering why there are gpg signatures for gmscore apks on github but I was not able to find instructions on verifying those signatures. I tried to search keyservers for the key ID.