Add extraEnvFrom also to db-migrate and db-initialize

My db migrate job is not working because I can't set the DATABASE_URL using GitLab CI/CD vars.

I added extraEnvFrom to auto-deploy-values.yaml to get the DATABASE_URL from a Kubernetes secret:

extraEnv:
  - name: DATABASE_URL
    valueFrom:
      secretKeyRef:
        name: staging-db-app
        key: uri

I think it makes sense to also add all defined extraEnv variables to the db-migrate and db-initialize jobs.