Ability to backup only once and stop the container

[SatishReddyBethi]

Feature:

Add the ability to run a postgres backup only once and stop. This feature will let us use this image in Kubernetes initContainers or add it as a docker dependency that only runs once before other containers can use that backup.

Implementation:

• Include an env variable such as BACK_UP_ONCE. Which if set to true will run a backup immediately and then stop container after the backup.
• This env variable would probably be in conflict with SCHEDULE variable. So, my though would be to either set a priority of one over the other or do not allow these two variables to be used together.

I like this using image if not for this one missing feature. So, please, I would really appreciate it if this feature can be added.
Thank you.

[prodrigestivill]

You already have this option by changing the command to /backup.sh as is explained in the README.md.

You can override this in k8s, docker-compose or in docker cli as in the example exposed.