feat: Add credential in github and bitbucket

Created by: harrisonliu5

Signed-off-by: harrisonliu5 harrisonliu_5@163.com

What type of PR is this?

/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #kubesphere/kubesphere/3675

Special notes for reviewers:

Additional documentation, usage docs, etc.:

/assign @leoendless /area devops