GPG not working in docker image

[nalsai]

The official dockerfile uses ubuntu:22.04 as a base, which only has the command gpg and not gpg2.
load_gpg_key uses the gpg2 command and therefore can't load a gpg key with that setup.
You get a generic "Failed to read config file" error message once you try to add a build-gpg-key (weirdly gpg-key on repos doesn't throw an error).

I symlinked it to fix the issue for me (ln -s /usr/bin/gpg /usr/bin/gpg2), but it should get fixed in the dockerfile.

Side note:
The ubuntu image uses LC_ALL=C, which can make gpg throw a "A locale function failed" error if the key includes non-ASCII characters (for example in the uid name). Exporting keys still works, so it's not a problem.