Add torch/LibTorch installation for packages depending on torch

[AntoineSoetewey]

As discussed in ropensci/software-review#784, packages importing torch fail to build in the check environment because LibTorch is not available. This installs the torch package and LibTorch at image build time, following the placement suggested by @mpadge. With TORCH_INSTALL=1 set, the same commit passes all checks (see joshuamarie/kindling#34).

[Copilot]

Pull request overview

Installs the R torch package and its required LibTorch runtime during image build so R packages that import torch can build and run tests successfully in the pkgcheck environment.

Changes:

• Add a Docker build step to install the R torch package.
• Run torch::install_torch() during the image build to provision LibTorch inside the container.

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[mpadge]

Thanks for the speedy response @AntoineSoetewey. Can you please put the torch install in the previous install2.r lines, in alphabetical order which should place it below current tidyverse on line 291. Then reduce the 3 comment lines to just the first, leaving at that point just the single line Rscript -e 'torch::install_torch() ? thanks!

[AntoineSoetewey]

Done, thanks for the review!

[mpadge]

@AntoineSoetewey Can I ask you to do one more thing please? The Docker image is generally only build on schedule. In order to immediately rebuild with this change, can you please do this:

git commit --allow-empty -m "[docker build]"
git push

That will trigger a rebuild as soon as this is merged. Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.12%. Comparing base (50a711a) to head (87a8367).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #393   +/-   ##
=======================================
  Coverage   92.12%   92.12%           
=======================================
  Files          52       52           
  Lines        3748     3748           
=======================================
  Hits         3453     3453           
  Misses        295      295           

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[AntoineSoetewey]

Done! Empty [docker build] commit pushed. Thanks again for the quick turnaround!

[mpadge]

@AntoineSoetewey I'll let you know in ropensci/software-review#784 when it's rebuilt and redeployed. That may take several hours.