returned a non-zero code: 2

[sp1d3rino]

When I run this Dockerfile the running stops after gpg command

gpg: directory '/root/.gnupg' created
gpg: new configuration file '/root/.gnupg/dirmngr.conf' created
gpg: new configuration file '/root/.gnupg/gpg.conf' created
gpg: keybox '/root/.gnupg/pubring.kbx' created
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key 4C206CA9: public key "Evan Lucas <evanlucas@me.com>" imported
gpg: can't connect to the agent: IPC connect call failed
gpg: key CC11F4C8: public key "Myles Borins <myles.borins@gmail.com>" imported
gpg: key 7D83545D: public key "Rod Vagg <rod@vagg.org>" imported
gpg: key 7EDE3FC1: public key "keybase.io/jasnell <jasnell@keybase.io>" imported
gpg: key 4EB7990E: public key "Jeremiah Senkpiel <fishrock123@rocketmail.com>" imported
gpg: key D2306D93: public key "keybase.io/octetcloud <octetcloud@keybase.io>" imported
gpg: key DBE9B9C5: public key "Colin Ihrig <cjihrig@gmail.com>" imported
gpg: key 7E37093B: public key "Christopher Dickinson <christopher.s.dickinson@gmail.com>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 8
gpg:               imported: 8

and I get this error

returned a non-zero code: 2

how can I solve it?

[OmgImAlexis]

This looks like an issue with your Dockerfile not this repo.