please add "apt install ca-certificates" to installation instructions

i just tried to install LibreWolf on Ubuntu Focal 20.04 ... failed due to sig check:

Ign:6 https://deb.librewolf.net focal InRelease Err:7 https://deb.librewolf.net focal Release Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 130.61.181.106 443] Reading package lists... Done E: The repository 'https://deb.librewolf.net focal Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. ...

Fixed by installing latest update to ca-certificates .. Please add this important,vital step to the INSTALLATION instructions at both:

1. https://librewolf.net/installation/debian/
2. https://deb.librewolf.net/ (the latter being referenced in Apt/Dpkg)

i.e., it should read to add not only:

sudo apt install -y wget gnupg lsb-release apt-transport-https

but to append to that line,
ca-certificates

and any/other affected distros, maybe ?