Add working-directory input to check-r-package

[TNonet]

This is an extension to #438 based on a request from @riccardoporreca.

I believe this PR is self explanatory. Working on checking these changes on my repo.

Looking for comments and feedback.

[codecov-commenter]

Codecov Report

Merging #444 (52ff960) into master (2049ddf) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #444   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines            1         1           
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  Hits             1         1           

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[jimhester]

maybe just call rcmdcheck::rcmdcheck(path = ${{ inputs.working-directory }}?

[jimhester]

Assuming you have r-lib/actions set as your upstream remote if you run

git fetch upstream
git rebase upstream/master
git push --force-with-lease

On your local repo it should remove the older commits from this PR.

[TNonet]

@jimhester, I am going to close this PR and open another PR once I remove the old commits. I somehow got myself in a bad git state.

[github-actions]

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