gitlab-production: declare the internal ingress ip

Related to T4063

Test Plan

pergamon:

diff origin/production/pergamon.softwareheritage.org current/pergamon.softwareheritage.org
*******************************************
+ Resource_record[k8s-gitlab-production/A+PTR] =>
   parameters =>
     "data": "k8s-gitlab-production.internal.softwareheritage.org.",
     "keyfile": "/etc/bind/keys/local-update",
     "record": "5.200.168.192.in-addr.arpa",
     "type": "PTR"
*******************************************
+ Resource_record[k8s-gitlab-production/A] =>
   parameters =>
     "data": "192.168.200.5",
     "keyfile": "/etc/bind/keys/local-update",
     "record": "k8s-gitlab-production.internal.softwareheritage.org",
     "type": "A"
*******************************************
*** End octocatalog-diff on pergamon.softwareheritage.org

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Migrated from D8654 (view on Phabricator)