Update alpine to resolve vulnerabilities

[ngraef]

What you expected to happen?

Please update the base image and rebuild to pull in security fixes.

What happened?

Prisma/twistlock scans of the latest weave-kube and weave-npc images report 40+ vulnerabilities, including 23 with a CVSS score of critical or high severity.

weave-kube:2.8.1

weave-npc:2.8.1

Anything else we need to know?

Alpine 3.10, the current base image, reached end of support on 2021-05-01.

I do not have enough knowledge of weave internals to determine whether any of these vulnerabilities can be exploited. I'm happy to provide more info about the specific CVEs if needed, but I image most/all of these can be resolved by pulling in base image updates.

Versions:

• weaveworks/weave-kube:2.8.1
• weaveworks/weave-npc:2.8.1

[ngraef]

Any thoughts? This project looks like it's no longer maintained.