WIP: Addons/keycloak

Summary

Adds keycloak as a bigbang addon.

chart/templates/keycloak/gitrepository.yaml

+{{- if and (not .Values.offline) .Values.addons.keycloak.enabled  }}
+apiVersion: source.toolkit.fluxcd.io/v1beta1
+kind: GitRepository
+metadata:
+  name: keycloak
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app.kubernetes.io/name: keycloak
+    app.kubernetes.io/component: "core"
+    {{- include "commonLabels" . | nindent 4}}
+spec:
+  ignore: |
+    # exclude file extensions
+    /**/*.md
+    /**/*.txt
+  interval: {{ .Values.flux.interval }}
+  url: {{ .Values.addons.keycloak.git.repo }}
+  ref:
+    {{- include "validRef" .Values.addons.keycloak.git | nindent 4 }}
+  {{- include "gitCreds" . | nindent 2 }}
+{{- end }}