use dashes instead of dots in image tags

deployment/helmchart/values.yaml

@@ -68,7 +68,7 @@ dashboard:
   image:
     registry: open.greenhost.net:4567
     repository: stackspin/dashboard/dashboard
-    tag: 0.1.7
+    tag: 0-1-7
     ## Optionally specify an array of imagePullSecrets.
     ## Secrets must be manually created in the namespace.
     ## ref: https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/
@@ -235,7 +235,7 @@ backend:
   image:
     registry: open.greenhost.net:4567
     repository: stackspin/dashboard-backend/dashboard-backend
-    tag: 0.2.0
+    tag: 0-2-0
     ## Optionally specify an array of imagePullSecrets.
     ## Secrets must be manually created in the namespace.
     ## ref: https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/