Fix for version comparisons from strings to semver (helm#4607)

* Fix for version comparisons from strings to semver

See helm#3002 for more detail

* Adding appVersion to pass validation

* Include pre-releases in the semver ranges

This is important when testing against alpha and beta builds of
Kubernetes along with environments that use pre-releases to denote
things other than pre-releases (e.g., gke denotes the environment
with a pre-releases)

stable/spotify-docker-gc/Chart.yaml

@@ -1,9 +1,10 @@
 name: spotify-docker-gc
 home: https://github.com/spotify/docker-gc
-version: 0.1.2
+version: 0.1.3
+appVersion: latest
 description: A simple Docker container and image garbage collection script.
 sources:
   - https://github.com/spotify/docker-gc
 maintainers:
-  - name: Vaughn Dice
+  - name: vdice
     email: [email protected]

stable/spotify-docker-gc/templates/daemonset.yaml

@@ -3,7 +3,7 @@ kind: DaemonSet
 metadata:
   name: {{ template "name" . }}
 spec:
-  {{- if ge .Capabilities.KubeVersion.Minor "6" }}
+  {{- if semverCompare "^1.6-0" .Capabilities.KubeVersion.GitVersion }}
   updateStrategy:
     type: RollingUpdate
   {{- end }}