GitHub Actions workflow for Dask tests

[adi611]

Types of changes

• New feature (non-breaking change which adds functionality)

Summary

This Pull Request adds the functionality to run Dask tests as part of the GitHub Actions workflow. The tests will run on pull requests and on push to the master branch.

Checklist

• [ ] I have added tests to cover my changes (if necessary)
• [ ] I have updated documentation (if necessary)

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: -0.05 :warning:

Comparison is base (426564e) 81.77% compared to head (1622cbc) 81.72%.

:exclamation: Current head 1622cbc differs from pull request most recent head f0227a9. Consider uploading reports for the commit f0227a9 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #677 +/- ## ========================================== - Coverage 81.77% 81.72% -0.05% ========================================== Files 20 20 Lines 4400 4400 Branches 1264 0 -1264 ========================================== - Hits 3598 3596 -2 - Misses 798 804 +6 + Partials 4 0 -4 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `81.72% <ø> (-0.05%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype#carryforward-flags-in-the-pull-request-comment) to find out more. [see 4 files with indirect coverage changes](https://app.codecov.io/gh/nipype/pydra/pull/677/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype)

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[djarecka]

could you please add this workflow to #673, as we discussed last week.

[ghisvail]

Superseded by #686