Default to high user ID

[rarkins]

Some security guides/scanners recommend running containers with a high user ID.

Refs:

• https://docs.prismacloud.io/en/enterprise-edition/policy-reference/kubernetes-policies/kubernetes-policy-index/bc-k8s-37
• https://www.stream.security/rules/ensure-containers-run-with-a-high-uid-to-avoid-host-conflict

Particularly, user 1000 is one of the most likely to have a conflict, but I think we can pick a really high one semi-randomly so that the chance a user needs to use it for something else already is close to zero.

[viceice]

do you have a preference?

[rarkins]

Pick a random high number?