Enigmail's plugin separates itself from the standard gpg
keyring.
That's why you don't see any output.
If you for any reason want to have your public (and private) key stored also in the gpg
keyring, just do the following, supposing you have your public and possibly even private key stored in one file named MyNewKey.asc:
gpg --import MyNewKey.asc
Example output of adding the private key to the gpg keyring:
gpg: key E46008C3: secret key imported
gpg: key E46008C3: "Vlastimil Burián <[email protected]>" not changed
gpg: key E46008C3: "Vlastimil Burián <[email protected]>" not changed
gpg: Total number processed: 2
gpg: unchanged: 2
gpg: secret keys read: 1
gpg: secret keys imported: 1
If you don't know how to get the keys from inside Enigmail to a file:
Thunderbird menu (F10) -> Enigmail -> Key Management -> select your key -> right click -> Export Keys to File -> Export Secret Keys.