Syncronize with pggb, more testing

[subwaystation]

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated
• If necessary, also make a PR on the nf-core/pangenome branch on the nf-core/test-datasets repo

This PR is trying to solve #26.
This PR affects Dockerfile, main.nf, and nextflow.config.

[subwaystation]

Hmm, if you take a look at https://github.com/nf-core/pangenome/pull/29/checks?check_run_id=1487357914, you can see that it does both --do_layout and --do_viz, although only one of them is specified. Any ideas why?! @Zethson

[Zethson]

LGTM

[github-actions]

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