Feat: authdb tables cleanup

[HeloiseJoffe]

Closes DIRACGrid/diracx-charts#222

Changes:

• Add functions to cleanup expired refresh tokens and flows from the AuthDB
• Add tests for each cleanup function in the DB

The global cleanup function can be called with this kubernetes cronjob :

metadata:
  name: diracx-cleanup-authdb
  namespace: diracx
spec:
  schedule: "0 0 1 * *"
  jobTemplate:
    spec:
      template:
        spec:
          restartPolicy: OnFailure
          containers:
            - name: cleanup
              image: ghcr.io/diracgrid/diracx/services:dev
              command:
                - /bin/sh
                - -c
                - |
                  /opt/conda/bin/python -c "
                  import asyncio
                  import os
                  from diracx.core.settings import AuthSettings
                  from diracx.db.sql import AuthDB
                  from diracx.logic.auth.token import cleanup_expired_data
                  import logging

                  logging.basicConfig(
                    level=logging.INFO
                  )

                  async def main():
                    db_url = os.getenv('DIRACX_DB_URL_AUTHDB')
                    settings = AuthSettings()
                    db = AuthDB(db_url)

                    async with db.engine_context():
                      async with db:
                        await cleanup_expired_data(db, settings)

                  asyncio.run(main())
                  "
              envFrom:
                - secretRef:
                    name: diracx-secrets
                - secretRef:
                    name: diracx-sql-connection-urls
                - secretRef:
                    name: diracx-dynamic-secrets
              volumeMounts:
                - name: keystore
                  mountPath: /keystore/jwks.json
                  subPath: jwks.json
          volumes:
            - name: keystore
              secret: 
                secretName: diracx-jwks
                items:
                  - key: jwks.json
                    path: jwks.json

Where could I add documentation to guide administrators in setting up the cronjob?

[read-the-docs-community]

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[aldbr]

I have not started to review it, but could you also open a PR in diracx-charts with the cron job and the documentation please?