Delete packages that only used during pip install
Created by: RolandMa1986
Signed-off-by: Roland.Ma rolandma@kubesphere.io
What type of PR is this?
/kind cleanup
What this PR does / why we need it:
- Delete packages that are only used during pip install to strip the base image.
- Update base image to python:3.9.7-alpine3.13 to fix security risk.
/cc @kubesphere/sig-installation