Add ubu20 images

[eb-oss]

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: https://github.com/edgexfoundry/ci-management/blob/master/.github/CONTRIBUTING.md

• [ ] Tests for the changes have been added (for bug fixes / features)

• [x] Added labels

  PR Type

  What kind of change does this PR introduce?

• [ ] Bugfix

• [x] Feature

• [ ] Code style update (formatting, local variables)

• [ ] Refactoring (no functional changes, no api changes)

• [ ] Documentation content changes

• [ ] Other... Please describe:

Issue Number:

Sandbox Testing

Test Links :

Are there any new imports or modules? If so, what are they used for and why?

Are there any specific instructions or things that should be known prior to reviewing?

Other information

[eb-oss]

@ernestojeda This is ready for review. Please let me know if you have any questions about the change.