Missing apt keys for buster-backports

[nicksterx]

During a fresh install I was getting the following error message

TASK [Add Buster backports for fixed libseccomp2.] ************************************************************************************************* ^[fatal: [127.0.0.1]: FAILED! => {"changed": false, "msg": "Failed to update apt cache: W:GPG error: http://httpredir.debian.org/debian buster-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131, E:The repository 'http://httpredir.debian.org/debian buster-backports InRelease' is not signed."}

I manually added these keys to fix it

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0E98404D386FA1D9
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6ED0E7B82643E131

[geerlingguy]

Fixed via #538