Move all Dockerfile samples to non-root user

Expected Behaviour

As an OpenFaaS end-user, I want to run all samples on my OpenFaaS cluster, even with the new non-root feature enabled.

Current Behaviour

Expected Behavior

Clicking on the link "Knative Slack channels" on this page should

$ minishift status
Minishift:  Running
Profile:    minishift
OpenShift:  Stopped
DiskUsage:  ERR of

perhaps this is related to the error state from the OpenShift isRunning check

The problem faced currently?

Currently an end user can put any value for meta. Writing security rules to make the enforce a schema for meta is hard.

How can we solve it?

Accept a schema for the meta field. Something similar to what we did for custom events.

If you want this feature to be implemented, give it a thumbs up reaction, so that we can determine which features are important

1、当没有API文档时的空数据提示
2、当没有搜索到API文档时的空数据提示