Fix resolving the exposed check-dir for the artifact upload

[riccardoporreca]

• Given the R-expression-nature of inputs.check-dir, we still rely on a step output defined from within R but just uses the expression.
• We need to define the output before running the checks to fix Error from actions/upload-artifact #593 (introduced by Fix using exposed check-dir when uploading artifacts #560) in case of check failures.

See #593 (comment) and run https://github.com/riccardoporreca/actions/runs/7679961505?check_suite_focus=true#step:6:174 for the reproduced issue

Error: Input required and not supplied: path

See the same case fixed when using proposed fix from the branch in https://github.com/riccardoporreca/actions/runs/7680406669?check_suite_focus=true#step:6:164

Run actions/upload-artifact@main
with:
name: Linux-rrelease-results
path: non-default-dir
if-no-files-found: warn

[codecov-commenter]

Codecov Report

Merging #595 (2dbc0b3) into v2-branch (3c89c7f) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           v2-branch      #595   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
===========================================
  Files              2         2           
  Lines             10        10           
===========================================
  Hits              10        10           

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[gaborcsardi]

Thanks!

[gaborcsardi]

Now deployed in @v2

[github-actions]

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