initdb commands for decryptor and keyper

[jannikluhn]

Closes #14 and #17

The linter doesn't like it, but I think it is wrong: Rows.Close doesn't return an error. It might be confused because Rows.Close from the database/sql package does.

[ghost]

So, you're calling the linter a liar? That's mean.

It just asks you to change the code to:

	rows, err := dbpool.Query(ctx, dbNotEmptyQuery)
	if err != nil {
		return false, errors.Wrap(err, "failed to ask db if it is empty")
	}
	defer rows.Close()

[jannikluhn]

You're right, I sincerely apologize to the linter.

[ghost]

Why do we need the empty database check? That's rather unusual I'd say. Maybe 'CREATE TABLE IF NOT EXISTS..`
is what you want?

[jannikluhn]

I just want to check that the db isn't already initialized and that it's not used for anything else. The former could be done with IF NOT EXISTS, but the latter can't. Would you say that's unnecessary?

[ghost]

yes, that's not necessary.

You might have a look at https://github.com/golang-migrate/migrate, which is what we may end up using to manage database migrations (though that's also not necessary at the moment).