feat: support authservice with redis, switch to pepr helm chart (#658)

## Description
* Updates Pepr to 0.34.0
* Uses Pepr Helm Chart
* Adds support to configure redis as authservice memory store

## Related Issue

Fixes #518

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [ ] Test, docs, adr added or updated as needed
- [ ] [Contributor
Guide](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)
followed

---------

Co-authored-by: Micah Nagel <[email protected]>

.yamllint

@@ -9,6 +9,7 @@ ignore:
   - '**/chart/templates**'
   - 'node_modules/**'
   - 'dist/**'
+  - 'src/pepr/uds-operator-config/templates**'
 
 rules:
   anchors: enable

docs/configuration/uds-operator.md

@@ -152,6 +152,17 @@ The UDS Operator uses the first `redirectUris` to populate the `match.prefix` ho
 
 For a complete example, see [app-authservice-tenant.yaml](https://github.com/defenseunicorns/uds-core/blob/main/src/test/app-authservice-tenant.yaml)
 
+#### External Session Store
+If you wish to scale Authservice horiztonally, Authservice supports using an [external redis session store](https://docs.tetrate.io/istio-authservice/configuration/oidc#session-store-configuration) which can be configured by setting [UDS_AUTHSERVICE_REDIS_URI](https://github.com/defenseunicorns/uds-core/blob/main/src/pepr/zarf.yaml#L20-L22).
+
+You can also specify the `AUTHSERVICE_REDIS_URI` variable in your `uds-config.yaml`:
+
+```yaml
+variables:
+  core:
+    AUTHSERVICE_REDIS_URI: redis://redis.redis.svc.cluster.local:6379
+```
+
 #### Trusted Certificate Authority
 
 Authservice can be configured with additional trusted certificate bundle in cases where UDS Core ingress gateways are deployed with private PKI.