Developer Maintenance📜

How to upgrade the Istio Gateway Package chart📜

istio-gateway is a passthrough chart. That means it does not fork an upstream chart but instead embeds one as a dependency. Because of this, the upgrade process is incredibly simple.

Checkout the branch that renovate created. This branch will have the image tag updates and typically some other necessary version changes that you will want. You can either work off of this branch or branch off of it.
Update dependency archives via helm (from repository root)
```
helm dependency update ./chart
```
Update version references for the chart in Chart.yaml. version should be <version>-bb.0 (ex: 1.25.1-bb.0) and appVersion should be <version> (ex: 1.25.1). Also validate that the Big Bang bigbang.dev/applicationVersions and helm.sh/images annotations are update to reflect the chart’s new application and image versions.
Add an entry to CHANGELOG.md detailing what changed in the update. At a minimum mention updating the dependency chart.
Regenerate the readme following the steps in Gluon.
Open an MR (or check the one that Renovate created for you) and validate that the pipeline is successful.
Follow the testing steps below for some manual confirmations.

Testing new Istio Gateway version📜

Generally, an istio-gateway update should be tested alongside the new versions of istio-base and istiod. Follow the steps outlined in the Istio base/istod Development Maintenance Guide

Big Bang components incorporated into this chart📜

Added networkPolicies section to enable default network policies and allow custom additional network policies to be added.

networkPolicies:
  enabled: true
  additionalPolicies: []

Added the following mtls section to enable mutual TLS used in chart/templates/bigbang/istio/peer-authentications/default.yaml:

mtls:
  # -- STRICT = Allow only mutual TLS traffic,
  # PERMISSIVE = Allow both plain text and mutual TLS traffic
  mode: STRICT