Support configuring security context

[ywk253100]

Currently, the containers in Harbor run as specific user(user ID 10000 or 999), and the user cannot be changed because some directives such as https://github.com/goharbor/harbor/blob/release-1.10.0/make/photon/registry/Dockerfile#L9. This prevents the supporting for configuringrunAsUser.
For other security context directives https://kubernetes.io/docs/concepts/policy/pod-security-policy/#example-policies, we need more test to verify they can work as expected.

There is already a PR #266 from community for the security context supporting

[NickHes]

@ywk253100 Any plans to support this in the future? With Kubernetes 1.24 reaching EOL and clusters migrating to 1.25 with the new policies I suspect the need for this will grow. Currently we cannot run Harbor with the new policies enabled. If you are open for PR's for this we could most certainly take a look.

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