apps-wc: fix netpol for nginx to allow uptime ingress

[viktor-f]

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What does this PR do / why do we need this PR?

When trying to curl the ingress-nginx. endpoint you often get timeouts. After looking into this it seems like this network policy is blocking this. Unfortunately setting the external traffic policy to local does not later control how nginx tries to talk to itself when it tries to call the metrics service.

Opening up the netpol to nginx solved the issue.

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[elastisys-staffan]

So this is basically opening up ingress-nginx to itself? LGTM 👍

[viktor-f]

So this is basically opening up ingress-nginx to itself? LGTM 👍

Yeah exactly. We have an ingress object that allows us to check the health of nginx. So then the backend for the ingress is one of the nginx services, which means that nginx will be calling that service.