External users have errors when building docker image on CI

[tangxifan]

Describe the bug Current docker image building step in CI requires the contributors to be a collaborator of the project.

To Reproduce Steps to reproduce the behavior:

1. Check the error messages in the docker image building step in PR #257 and PR #247

Expected behavior The CI should not be limited to the collaborator of the project

Screenshots The error message

Enviornment (please complete the following information):

• OS: ubuntu
• Compiler gcc
• Version: latest master

[ganeshgore]

@yashton Can you look into this ? This is the CI run https://github.com/lnis-uofu/OpenFPGA/actions/runs/610908414

[yashton]

Will do