Pulling this Docker image GPG Error

[kingbin]

I'm trying to pull this Docker image and the container stops executing with the final output is printed and then the vm is terminated:

dch warning: Previous package version was Debian native whilst new version is not
gpg-agent[6265]: directory '/root/.gnupg' created
gpg-agent[6265]: directory '/root/.gnupg/private-keys-v1.d' created
SSH_AUTH_SOCK=/root/.gnupg/S.gpg-agent.ssh; export SSH_AUTH_SOCK;
gpg-agent[6266]: gpg-agent (GnuPG) 2.1.11 started
gpg: keyring `/root/.gnupg/secring.gpg' created
gpg: keyring `/root/.gnupg/pubring.gpg' created
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

Do I need to pass in my ssh key for Ubuntu Core by chance? That's the only thing I can think of that I may need somewhere along the lines of booting an ubuntu core image.

I'm wanting to use a docker image to test snaps.

I'm trying this on a mac os: 10.12.5
Docker: Version 17.06.0-rc2-ce-mac14 (18280)
Channel: edge
Docker Kitematic 0.12.0