R does not work on linux/arm64

[leafty]

Build logs: https://github.com/SwissDataScienceCenter/renku/actions/runs/26038534670/job/76543319861?pr=4459

[builder] === ✨ Renku RStudio buildpack ===
[builder]   Build configuration:
[builder]     $BP_RENKU_FRONTENDS	rstudio	The frontends to install
[builder] Downloading rstudio 2026.01.0-392 in /layers/renku_rstudio/cache
[builder] Unpacking /layers/renku_rstudio/cache/rstudio-2026.01.0-392.deb in /tmp/rstudio
[builder] dpkg-deb: error: '/layers/renku_rstudio/cache/rstudio-2026.01.0-392.deb' is not a Debian format archive
[builder] ERROR: failed to build: exit status 2
ERROR: failed to build: executing lifecycle: failed with status code: 51