chore: add PeerAuthentication docs and Made for UDS Badge (#174)

## Description

This adds the Made for UDS badge and additional docs on the
PeerAuthentication exceptions to GitLab

## Related Issue

Fixes #164 

## Type of change

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

## Checklist before merging

- [X] Test, docs, adr added or updated as needed
- [X] [Contributor Guide
Steps](https://github.com/defenseunicorns/uds-package-gitlab/blob/main/CONTRIBUTING.md#developer-workflow)
followed

Author: Racer159

.images/made-for-uds.svg

@@ -1,5 +1,6 @@
 # 🏭 UDS GitLab Zarf Package
 
+[<img alt="Made for UDS" src="./.images/made-for-uds.svg" height="20px"/>](https://github.com/defenseunicorns/uds-core)
 [![Latest Release](https://img.shields.io/github/v/release/defenseunicorns/uds-package-gitlab)](https://github.com/defenseunicorns/uds-package-gitlab/releases)
 [![Build Status](https://img.shields.io/github/actions/workflow/status/defenseunicorns/uds-package-gitlab/tag-and-release.yaml)](https://github.com/defenseunicorns/uds-package-gitlab/actions/workflows/tag-and-release.yaml)
 [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/defenseunicorns/uds-package-gitlab/badge)](https://api.securityscorecards.dev/projects/github.com/defenseunicorns/uds-package-gitlab)

README.md

@@ -11,7 +11,7 @@ spec:
     matchLabels:
       {{ .Values.postgres.selector | toYaml }}
   portLevelMtls:
-    # Postgres exception to support GitLab dependency init containers
+    # Postgres exception to support GitLab 'dependency' init containers
     {{ .Values.postgres.port }}:
       mode: PERMISSIVE
 {{- end }}

chart/templates/postgres-peerauthentication.yaml

@@ -11,7 +11,7 @@ spec:
     matchLabels:
       {{ .Values.redis.selector | toYaml }}
   portLevelMtls:
-    # Redis/Valkey exception to support GitLab dependency init containers
+    # Redis/Valkey exception to support GitLab 'dependency' init containers
     {{ .Values.redis.port }}:
       mode: PERMISSIVE
 {{- end }}

chart/templates/redis-peerauthentication.yaml

@@ -11,6 +11,9 @@ Network policies are controlled via the `uds-gitlab-config` chart in accordance
 - `postgres`: sets network policies for accessing a Postgres database from all GitLab services (`webservice`, `toolbox`, `sidekiq`, `migrations`, `gitlab-exporter`)
 - `custom`: sets custom network policies for the GitLab namespace - this allows for custom integrations with other services (i.e. Jira)
 
+> [!NOTE]
+> Currently the GitLab UDS Package contains Istio `PeerAuthentication` exceptions to allow the `dependency` init containers to reach out and check the Redis and Postgres services.  These are only added with `redis.internal` or `postgres.internal` set to `true` and will be removed once UDS Core [switches to native sidecars](https://github.com/defenseunicorns/uds-core/issues/536).
+
 ## Database
 
 GitLab uses Postgres as its backing database service and supports the [common database providers within UDS Software Factory](https://github.com/defenseunicorns/uds-software-factory/blob/main/docs/database.md).