ci: debug regression tests

- distinction between R versions which produce the results to test
- add Gitlab artefact instruction for making results available for tests in next jobs in the pipeline

Refs #59
15 jobs for 59-add-comparative-tests-with-master-branch-on-examples in 30 minutes and 49 seconds (queued for 8 minutes and 50 seconds)
Status Job ID Name Coverage
  Update Packages
passed #104348
update_packages_devel

00:00:01

passed #104349
update_packages_oldrel

00:00:01

passed #104347
update_packages_patched

00:00:01

 
  Build
passed #104351
build_devel

00:00:20

passed #104352
build_oldrel

00:00:19

passed #104350
build_patched

00:00:20

 
  Regression
passed #104354
regression_devel

00:00:55

passed #104355
regression_oldrel

00:00:46

passed #104353
regression_patched

00:00:55

 
  Tests
passed #104359
check_as_cran_devel

00:01:28

passed #104361
check_as_cran_oldrel

00:01:13

passed #104357
check_as_cran_patched

00:01:26

passed #104358
check_not_cran_devel

00:08:17

passed #104360
check_not_cran_oldrel

00:06:22

passed #104356
check_not_cran_patched

00:08:18