staging: Deploy swh.provenance rpc

Depends on the graph (currently, there is no graph service in staging yet).

plan:

• Prepare small specification document [1]
• Add keycloak swh.web.api.provenance webapp role
• Prepare sentry dsn and reference in private repository
• swh-apps!43 (merged): swh-apps: Create provenance docker image (check for an existing one if any)
• swh/infra/ci-cd/swh-charts!466 (merged): swh-chart: Develop provenance template
• Test in next-version (just to lift papercuts)
• Deploy in staging [1]
• Test workload
  • keycloak connection
  • sentry setup
  • metrics for monitoring (gunicorn [3], ingress [4])
  • Basic queries

Provenance service deployed accessible from the vpn network: http://provenance.internal.staging.swh.network

[1] https://hedgedoc.softwareheritage.org/LsrKvOq7QJ6sbdcE5Rr3tA

[2] https://webapp.staging.swh.network/api/1/provenance/whereis/swh:1:cnt:dcb2d732994e615aab0777bfe625bd1f07e486ac/

[3] https://grafana.softwareheritage.org/goto/_jb0KWeSk?orgId=1

[4] https://grafana.softwareheritage.org/goto/pRLxFZeSk?orgId=1