Update Dockerfile; remove securityContext runAsUser

[realshuting]

Related issue

What type of PR is this

/kind bug

This PR fixes #1662:

• removes securityContext runAsUser
• run Kyverno process with uid 10001 (Dockerfile)
• add back build info when publishing images

Proposed changes

Checklist

• I have read the contributing guidelines.
• [] I have added tests that prove my fix is effective or that my feature works.
• [] I have added or changed the documentation.

Further comments

[realshuting]

With the changes made in the PR, I verified Kyverno is running with uid 10001, without runAsUser specified in the deployment manifest:

✗ k exec -ti kyverno-57dd9fdfbc-fvm79 -n kyverno -- ps aux
PID   USER     TIME  COMMAND
    1 10001     0:02 ./kyverno --filterK8sResources=[Event,*,*][*,kube-system,*
   16 10001     0:00 ps aux