setup-r gets r-version from renv.lock

[iqis]

• If user provides renv for r-version in setup-r, look for ./renv.lock.
  • if found, parse and use R version recorded within
  • if not, throw error

#700

[iqis]

Used . here as it will be resolved in the calling scope. Better way of doing this?

[codecov-commenter]

Codecov Report

Merging #701 (198e6f8) into v2-branch (ac4564f) will not change coverage.
The diff coverage is n/a.

❗ Current head 198e6f8 differs from pull request most recent head 339646c. Consider uploading reports for the commit 339646c to get more accurate results

@@             Coverage Diff             @@
##           v2-branch      #701   +/-   ##
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  Coverage     100.00%   100.00%           
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  Files              2         2           
  Lines             10        10           
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  Hits              10        10           

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[gaborcsardi]

Thanks!

[github-actions]

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