fix failing docker build

Created by: zryfish

What type of PR is this?

Add one of the following kinds: /kind bug /kind failing-test

What this PR does / why we need it:

Dockerfile base image node:12-alpine3.14 failed to install python2 https://prow.kubesphere.io/view/s3/prow-logs/logs/pull-console-build-image/1469202824981123072.

Previously, app add python to python2, but the package name renamed to python2 in node:12-alpine3.14.

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Does this PR introduced a user-facing change?

None

Additional documentation, usage docs, etc.: