add keycloak (#475)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

## Release Notes

- **New Features**
- Integrated Keycloak service into deployment configurations across
multiple files, enhancing user authentication capabilities.
- Introduced a new Helm chart for Keycloak, facilitating easier
deployment and management.
- Added Kubernetes Ingress and Service resources for Keycloak to manage
external access and internal service routing.
- Configured a PostgreSQL cluster specifically for Keycloak, ensuring
data persistence.

- **Bug Fixes**
- Updated versioning in the installer script to ensure compatibility
with the latest configurations.

- **Documentation**
- Added detailed configuration options for Keycloak deployment,
including resource limits and ingress settings.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

scripts/installer.sh

@@ -3,7 +3,7 @@ set -o pipefail
 set -e
 
 BUNDLE=$(set -x; kubectl get configmap -n cozy-system cozystack -o 'go-template={{index .data "bundle-name"}}')
-VERSION=7
+VERSION=8
 
 run_migrations() {
   if ! kubectl get configmap -n cozy-system cozystack-version; then

scripts/migrations/7

@@ -0,0 +1,9 @@
+#!/bin/sh
+# Migration 7 --> 8
+
+
+host=$(kubectl get hr tenant-root -n tenant-root -o yaml | grep 'host:' | awk '{print $2}')
+kubectl patch configmap -n cozy-system cozystack --type merge -p "{\"data\":{\"root-host\":\"$host\"}}"
+
+# Write version to cozystack-version config
+kubectl create configmap -n cozy-system cozystack-version --from-literal=version=8 --dry-run=client -o yaml | kubectl apply -f-