I did not see either one of three ways to use persistent storage in any of the docker files:
- dir mount
- named volume
- volume plugin
Unless I'm missing something, there is no persistent storage. I'm sorry, but I really must be blind. IMO the data is gone as soon as you remove the container. (This is bad and should not be the case.)
Also, what happens, when you upgrade Postgres? (That's another story though.)
P.S.: Persistent storage does not mean that the storage won't be deleted when restarting the container - that is a given and in many cases even required when using stateless services. Persistent storage means the data persists in case the container is gone.