Auto create onepanel database for core - as an init container.

[Vafilor]

Issue / Background

Right now, you have to manually create a Onepanel database yourself. This should be automatic.

Idea

Use an init container to create the database when onepanel-core starts.

Potential Issues

1. Database might already exist.

2. For postgres databases, we need to specify a default database that exists (unless there's a way to do it without a database existing?). This is usually postgres however, we will need a parameter for this in the params.yaml file in case it is different.

I can't think of a case where this would cause a backwards compatibility issue, but open to feedback.

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[rushtehrani]

One issue we can potentially run into is if the user changes the database name when they're first setting up, for example if they had the wrong name.