feat: add go-task, set up prettier, format yaml (#50)

cluster/apps/system-upgrade/system-upgrade-controller/agent-plan.yaml

@@ -12,14 +12,14 @@ spec:
   channel: https://update.k3s.io/v1-release/channels/v1.20
   nodeSelector:
     matchExpressions:
-    - key: node-role.kubernetes.io/master
-      operator: NotIn
-      values:
-      - "true"
+      - key: node-role.kubernetes.io/master
+        operator: NotIn
+        values:
+          - "true"
   prepare:
     image: rancher/k3s-upgrade
     args:
-    - "prepare"
-    - "k3s-server"
+      - "prepare"
+      - "k3s-server"
   upgrade:
     image: rancher/k3s-upgrade