[R][CI] Nightly R build uploads failing for a few weeks #47983
Description
Describe the bug, including details regarding any error messages, version, and platform.
The R nightly upload workflow (.github/workflows/r_nightly.yml) has been failing every day since at least October 9, 2025 (~3 weeks).
Error:
The workflow fails during the "Build Repository" step with an R script error:
Error in c(sub("r-pkg", repo_root, current_pkg_path), sub("r-lib", paste0(repo_root, :
##[error]Process completed with exit code 1.
Recent failed run: https://github.com/apache/arrow/actions/runs/18877376041
The error occurs in the R script section (lines ~131-150 of the workflow file) that manipulates file paths for copying artifacts from crossbow to the nightly repository structure.
Component(s)
Continuous Integration, R