feat(apps): move koel and zerotier to stable (#2232)

* feat(koel): move to stable

* feat(zerotier): move to stable

* update app req

charts/stable/koel/Chart.yaml

@@ -0,0 +1,33 @@
+apiVersion: v2
+appVersion: "latest"
+dependencies:
+- name: common
+  repository: https://truecharts.org
+  version: 9.1.6
+- condition: mariadb.enabled
+  name: mariadb
+  repository: https://truecharts.org/
+  version: 2.0.6
+description: Koel is a simple web-based personal audio streaming service written in Vue on the client side and Laravel on the server side.
+home: https://github.com/truecharts/apps/tree/master/charts/stable/koel
+icon: https://truecharts.org/_static/img/appicons/koel.png
+keywords:
+- koel
+- music
+- stream
+kubeVersion: '>=1.16.0-0'
+maintainers:
+- email: info@truecharts.org
+  name: TrueCharts
+  url: https://truecharts.org
+name: koel
+sources:
+- https://github.com/koel/docker
+- https://hub.docker.com/r/hyzual/koel
+- https://github.com/koel/koel
+version: 1.0.0
+annotations:
+  truecharts.org/catagories: |
+    - media
+  truecharts.org/SCALE-support: "true"
+  truecharts.org/grade: U