How to upgrade the Istiod Package chart

1. From the root of the repo run, helm dependencies update.
2. Modify the version in chart/Chart.yaml - append -bb.0 to the chart version from upstream.
3. Update CHANGELOG.md adding an entry for the new version and noting all changes (at minimum this should include the line Updated istiod to x.x.x).
4. Generate the README.md using the gluon library script guidelines noting any additional chart changes you make during development testing.

Branch/Tag Config

Cluster setup

Deploy Bigbang

Validation/Testing Steps