Add tests for 22.04 on devel and release, and for 20.04 on devel

[krlmlr]

Check if we can reproduce CRAN failures.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d2cba32) 64.23% compared to head (6c0bb98) 64.23%.

❗ Current head 6c0bb98 differs from pull request most recent head 50863b3. Consider uploading reports for the commit 50863b3 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #61   +/-   ##
=======================================
  Coverage   64.23%   64.23%           
=======================================
  Files          13       13           
  Lines         274      274           
=======================================
  Hits          176      176           
  Misses         98       98           

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[krlmlr]

@gaborcsardi: Any idea why I can install R-devel but not R-release on 22.04? I tried three times already.

[gaborcsardi]

IDK, it seems to work now: https://github.com/gaborcsardi/testrtools/actions/runs/3302513253/jobs/5449426968