[NOT FOR MERGING]: prototype: Send logs to team account based on namespace

[bmcfeely]

We're trying to sort out a way that CF can allow teams to put their logs in their own team's account instead of account 1.

This PR prototypes providing a way for teams to tell the chart which key (and therefore to which account) they want their logs sent with based on a pod's namespace. Any pod that doesn't have an explicit mapping from its namespace to an account key will default to be sent with the account 1 key.

This idea is:

• Creates a ConfigMap that teams can put the Vault location for their api keys (this prototype just hardcodes keys locally, I was lazy :P)
• Creates a chart "hook" that runs on install and upgrade that generates the Fluent Bit [OUTPUT] blocks by running a NodeJS app to do that
• Including those [OUTPUT] blocks in the "main" fluent-bit.conf

For CF, we'd do something a little different (but basically the same), since CF uses their own Helm chart. I think it would still be mostly the same. I didn't do the prototype there because, uh, I don't know. 😄

I tested this by:

• Editing the chart to replace REDACTED_KEY_FOR_PRODUCTION_756053 with the actual key for production 756053
• Installing the chart with helm uninstall newrelic-logging && helm install newrelic-logging ./charts/newrelic-logging --set licenseKey=<REDACTED_ACCOUNT_1_KEY> --set cluster=brian-kind && kubectl logs $(kubectl get pod | grep newrelic-logging | grep -v creator | awk '{print $1}')
• Creating a pod in the logging namespace
• Verifying that the logging namespace pod's logs go to account 756053 (and not account 1)
• Verifying that the other pods in non-logging namespaces go to account 1

Account 1 logs

(note that it doesn't include logs from the logging namespaces)

Account 756053 logs

(note that it doesn't include logs from other namespaces besides logging)

[bmcfeely]

I'm pretty sure that we have a way to get secrets from Vault into k8s secrets so that they can be used. I'm assuming that's possible, I'm skipping it here (and just hardcoding keys locally) just so I can get done with the prototype sooner.