Bug: deploying external pycsw breaks metadata download and links in api/v2/datasets links section

[mwallschlaeger]

Bug Description

when using external pycsw, links in datasets api endpoint are not reachable from the outside world. apprearing like:

{
                "extension": "xml",
                "link_type": "metadata",
                "name": "Dublin Core",
                "mime": "text/xml",
                "url": "[http://geonode-pycsw:8000?request=GetRecordById&service=CSW&version=2.0.2&id=dbe6e1b1-4005-416b-a36e-cd16b9156136&outputschema=http%3A%2F%2Fwww.opengis.net%2Fcat%2Fcsw%2F2.0.2&elementsetname=full](http://geonode-pycsw:8000/?request=GetRecordById&service=CSW&version=2.0.2&id=dbe6e1b1-4005-416b-a36e-cd16b9156136&outputschema=http%3A%2F%2Fwww.opengis.net%2Fcat%2Fcsw%2F2.0.2&elementsetname=full)"
            },

Reproduction Steps

enable pycsw in values.yaml with:

pycsw:
  enabled: true