Make database secrets more consistent

[corneliusroemer]

@anna-parker and I were looking into how to get the database name from the config. We were a bit confused that we currently specify secrets for keycloak-database and loculus-database in inconsistent ways:

  database:
    type: sealedsecret
    clusterWide: "true"
    encryptedData:
      host: AgDUG
      password: AgCm
      url: AgC
      username: AgAp
  keycloak-database:
    type: sealedsecret
    clusterWide: "true"
    encryptedData:
      addr: AgAw
      database: AgB
      password: AgDB
      port: Ag
      username: AgAuZZ

For more consistency we should

• rename database to loculus-database
• use identical fields in encrypted data, i.e. also have database, addr, url ... in loculus-database and vice versa

[theosanderson]

I wouldn't add unused fields: it's already a fair bit of effort to seal all the secrets. That doesn't stop you getting consistency, I expect, but it means you need to construct the URL from the address and the port, for example