Merge branch 'CI'

No completely done yet, but CI is almost working.
1 job for master in 42 minutes and 58 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed test #4804
docker

00:42:58

 
Name Stage Failure
failed
test Test
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> covr::package_coverage()
ERROR: Job failed: exit code 1