Update NetworkPolicies to support Distrbuted Mode

To support #1 (closed), the network policies that are in place need to be adjusted to use different labels depending on the strategy being used. Already some present in upstream chart: https://github.com/grafana/helm-charts/blob/9b6d3f1f0b986ef60b0917e095500d66841b8861/charts/loki-simple-scalable/templates/networkpolicy.yaml

Distributed:

Read Nodes

app.kubernetes.io/component: read

https://github.com/grafana/helm-charts/blob/9b6d3f1f0b986ef60b0917e095500d66841b8861/charts/loki-simple-scalable/templates/read/_helpers-read.tpl#L13

Ingress from:

• Istio Ingress
• Prometheus

Egress:

• Write Nodes

Write Nodes

app.kubernetes.io/component: write

https://github.com/grafana/helm-charts/blob/9b6d3f1f0b986ef60b0917e095500d66841b8861/charts/loki-simple-scalable/templates/write/_helpers-write.tpl#L13

Ingress From:

• ReadNodes
• PromTail
• Prometheus

Egress:

• Storage

Monolith:

Don't have anything yet: https://repo1.dso.mil/platform-one/big-bang/apps/sandbox/loki/-/blob/main/chart/values.yaml#L164

Ingress:

• Istio
• Prometheus

Egress:

• Storage

See: https://grafana.com/docs/loki/latest/fundamentals/architecture/