[Bug]: Unable to sign commits with GPG in dev container

[apgrucza]

Current Behavior (bug)

When Git is configured to sign commits with a GPG key, making a commit inside the dev container produced by devbox generate devcontainer fails with the following error:

error: cannot run gpg: No such file or directory
error: gpg failed to sign the data
fatal: failed to write commit object

Expected Behavior (fix)

gnupg2 should be installed in the container, as per the Sharing GPG Keys instructions.

Additional context

In VS Code, the Dev Containers: Show Container Log command shows:

...
[16707 ms] Start: Run in container: gpgconf --list-dir agent-socket
[16710 ms] 
[16710 ms] /bin/sh: 19: gpgconf: not found
[16710 ms] Exit code 127
[16710 ms] gpg-agent: No agent-socket found in container.
...