feat: add ingress for mongodb

Michelle Weidlingrequested to merge
add-ingress-for-mongo into main

With this MR, the ingress.yaml is configured to deal with multiple paths available in the ingress definition. We need both the API and the MongoDB to have an ingress, otherwise Vault will not be able to connect to the database. (QuiVer currently runs on the dev cluster, but Vault runs on the prod cluster, which means that Vault cannot talk to MongoDB's service directly; it needs an ingress.)

See also https://gitlab.gwdg.de/subugoe/argocd-provisioning/-/merge_requests/194.

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