Fixing add-apt-repository flags

1 job for 102/mike/filterDefaults in 39 seconds (queued for 3 seconds)
Name Stage Failure
whats-open-py3.7 Test
Hit:3 buster-updates InRelease
Ign:4 trusty InRelease
Get:5 trusty Release [58.5 kB]
Get:6 trusty Release.gpg [933 B]
Ign:6 trusty Release.gpg
Reading package lists...
W: GPG error: trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
E: The repository ' trusty Release' is not signed.
ERROR: Job failed: exit code 1