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

* feat(koel): move to stable

* feat(zerotier): move to stable

* update app req

charts/stable/zerotier/Chart.yaml

@@ -0,0 +1,29 @@
+apiVersion: v2
+kubeVersion: ">=1.16.0-0"
+name: zerotier
+version: 1.0.0
+appVersion: "1.8.4"
+description: ZeroTier is a smart programmable Ethernet switch for planet Earth
+type: application
+deprecated: false
+home: https://github.com/truecharts/apps/tree/master/charts/stable/zerotier
+icon: https://truecharts.org/_static/img/appicons/zerotier.png
+keywords:
+  - zerotier
+  - network
+sources:
+  - https://hub.docker.com/r/zerotier/zerotier
+dependencies:
+- name: common
+  repository: https://truecharts.org
+  version: 9.1.6
+    # condition:
+maintainers:
+- email: info@truecharts.org
+  name: TrueCharts
+  url: https://truecharts.org
+annotations:
+  truecharts.org/catagories: |
+    - network
+  truecharts.org/SCALE-support: "true"
+  truecharts.org/grade: U