Use shorter DNS name for pod-to-pod networking

[EronWright]

Proposed changes

Eliminates the use of the hardcoded DNS suffix "svc.cluster.local", e.g. to support "VPC scope DNS".

Workspace RPC

For workspace RPC connectivity, the operator now uses the "namespace-scoped" short name of the workspace pod, e.g. guestbook-workspace.default rather than guestbook-workspace.default.svc.cluster.local..

❯ kubectl get workspace
NAME                      IMAGE                           READY   ADDRESS
kubernetes-py-guestbook   pulumi/pulumi:3.134.1-nonroot   True    kubernetes-py-guestbook-workspace.default:50051

This approach is an improvement but isn't ideal for cross-cluster communication. A possible future enhancement would be to fully resolve the address to be persisted in the status block (e.g. to guestbook-workspace.default.svc.cluster1.).

See DNS for Services and Pods for more information, which says:

In summary, a Pod in the test namespace can successfully resolve either data.prod or data.prod.svc.cluster.local.

Program Artifact

The program artifact is fetched by workspace pods from the controller itself, based on the configured advertised address. This PR shortens the advertised address used by the default installation manifest, and updates the Helm chart to support a configurable override.

❯ kubectl get program
NAME          AGE   URL
random-yaml   28m   http://pulumi-kubernetes-operator.pulumi-kubernetes-operator:80/programs/default/random-yaml

Related issues (optional)

Closes #759

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.19%. Comparing base (92416e3) to head (3adb333).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #764   +/-   ##
=======================================
  Coverage   50.19%   50.19%           
=======================================
  Files          30       30           
  Lines        4210     4210           
=======================================
  Hits         2113     2113           
  Misses       1910     1910           
  Partials      187      187           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[rquitales]

TIL that namespace-scoped fqdns are valid. LGTM