Upgrade job needs it's own container image

[hardillb]

Current Behavior

While testing on OpenShift, the job script can't install the psql client because it's no longer running as root in the container (which is just the base alpine container.

Expected Behavior

We should add the psql command to the file-server container so we can re-use the same container image to run the db upgrade jobs

Steps To Reproduce

Try and install on OpenShift

Environment

• FlowFuse version: 2.0.0
• Node.js version: 18
• npm version: 9
• Platform/OS: K8S
• Browser: NA