Add git ssh support

[leki75]

• installed openssh-client and su-exec packages
• added ssh key as a secret to the container
• changed nobody user to katafygio to have a home directory for ssh keys
• used entrypoint.sh to set ssh key and config at runtime

[coveralls]

Coverage remained the same at 89.651% when pulling a7b5dc7 on leki75:master into 15a5d24 on bpineau:master.

[bpineau]

Thanks for submitting this @leki75!

The patch is correct, but changing the process uid would bite existing users having data.

Would you mind mouting the secrets with mountPath: "/.ssh" (as / is nobody's home) and settings securityContext.fsGroup: 65534?

That should be enough to consume ssh key from an unmodified image (except openssh-client package addition). As a bonus, secrets changes will propagate.

[leki75]

Thank you for your comments! I have added a new commit where I do all the modifications you suggested. I was curious that mounting the secrets in /.ssh works and it does!

[MaxDiOrio]

When do we think this will be merged and available in Docker? This merge should allow using SSH to store the backups in AWS CodeCommit.

[bpineau]

Thanks for the PR and for your patience @leki75 !
@MaxDiOrio understood; I'll push a new release (including to Docker hub) today.