Add workflow dispatch to CI actions

[IAlibay]

Changes made in this Pull Request:

• Add workflow_dispatch to actions

This will allow us to manually trigger CI as necessary. I find myself quite often needing to manually dispatch cron CI so this will make life a bit easier.

Developers certificate of origin

• I certify that this contribution is covered by the LGPLv2.1+ license as defined in our LICENSE and adheres to the Developer Certificate of Origin.

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📚 Documentation preview 📚: https://mdanalysis--4398.org.readthedocs.build/en/4398/

[github-actions]

Linter Bot Results:

Hi @IAlibay! Thanks for making this PR. We linted your code and found the following:

There are currently no issues detected! 🎉

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (97b5a61) 93.41% compared to head (14c2fb8) 93.41%.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop    #4398     +/-   ##
==========================================
  Coverage    93.41%   93.41%             
==========================================
  Files          171      185     +14     
  Lines        22511    23625   +1114     
  Branches      4129     4129             
==========================================
+ Hits         21028    22069   +1041     
- Misses         963     1036     +73     
  Partials       520      520             

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[hmacdope]

LGTM @IAlibay