Merge pull request #41135 from SimenB/no-cache-alpine-image
Automatic merge from submit-queue
chore (samples): Don't cache apks at all in Dockerfiles
**What this PR does / why we need it**:
It simplifies the sample Dockerfiles somewhat.
https://github.com/gliderlabs/docker-alpine/blob/master/docs/usage.md#disabling-cache
**Special notes for your reviewer**:
While I'm here, any reason the Redis sample doesn't use the official Redis image from Dockerhub?
**Release note**:
```release-note
```
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