Fix e2e test for rootless image.

[liangyuanpeng]

e2e CI is broken (https://github.com/kubernetes-sigs/apiserver-network-proxy/actions/runs/7935785136) after merge #564, the reason is permission denied when reading /etc/kubernetes with rootless image. This PR adds an initContainer to change the /etc/kubernetes directory permissions to fix this issue.

Another option is run root as user for ANP server pod,But this will not testing rootless container images.

...
      securityContext:
        runAsUser: 0
...

The error logs:

...
2024-02-16T20:20:47.774302668Z stderr F 
2024-02-16T20:20:47.774304462Z stderr F E0216 20:20:47.774123       1 main.go:48] error: failed to load kubernetes client config: error loading config file "/etc/kubernetes/admin.conf": open /etc/kubernetes/admin.conf: permission denied

/cc @jkh52 @cheftako @ipochi

[k8s-ci-robot]

Hi @liangyuanpeng. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: liangyuanpeng
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[jkh52]

/ok-to-test

[cheftako]

774? 744? 444?

[tallclair]

I'm a bit uncomfortable making the apiserver key world-readable. Seems like it defeats the point of running this as non-root.

[liangyuanpeng]

I have tested it with 444 446 and 447, only working with 447, This is a bit counter-intuitive since the ANP server only requires read permissions (except /etc/kubernetes/konnectivity-server ).

How about change this directory to /etc/srv/kubernetes ? To keep it consistent with examples/kubernetes/konnectivity-server.yaml, but the apiserver key still world-readable on /etc/srv/kubernetes :(

[liangyuanpeng]

Does manually creating the required files and starting ANP with the 1002 user increase the confidence in merging the PR?

...
securityContext:
        runAsUser: 1002
        runAsGroup: 1000
...

[k8s-ci-robot]

PR needs rebase.

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