[R][CI] two linux-as-cran jobs fail with leftover files

[jonkeane]

Describe the bug, including details regarding any error messages, version, and platform.

For a little while now the linux-as-cran ubuntu-next and ubuntu-release jobs have been failing because there are two directories (.cache and .local) that are left after we build + test.

Oddly, this doesn't happen in other varieties (ubuntu-clang, clang20, etc.).

https://github.com/ursacomputing/crossbow/actions/runs/13742958908/job/38434404761

+ '[' 'total 40K
drwx------ 1 root root 4.0K Mar  6 06:23 .
drwxr-xr-x 1 root root 4.0K Mar  9 00:33 ..
drwxr-xr-x 8 1001  118 4.0K Mar  6 03:18 .TinyTeX
-rw-r--r-- 1 root root 3.1K Oct 15  2021 .bashrc
-rw-r--r-- 1 root root  161 Jul  9  2019 .profile
-rw-r--r-- 1 root root  241 Mar  6 06:23 .wget-hsts
drwxr-xr-x 1 root root 4.0K Mar  6 06:23 R
drwxr-xr-x 2 root root 4.0K Mar  6 06:23 bin' '!=' 'total 48K
drwx------ 1 root root 4.0K Mar  9 00:33 .
drwxr-xr-x 1 root root 4.0K Mar  9 00:33 ..
drwxr-xr-x 8 1001  118 4.0K Mar  6 03:18 .TinyTeX
-rw-r--r-- 1 root root 3.1K Oct 15  2021 .bashrc
drwxr-xr-x 4 root root 4.0K Mar  9 00:33 .cache
drwxr-xr-x 3 root root 4.0K Mar  9 00:33 .local
-rw-r--r-- 1 root root  161 Jul  9  2019 .profile
-rw-r--r-- 1 root root  241 Mar  6 06:23 .wget-hsts
drwxr-xr-x 1 root root 4.0K Mar  6 06:23 R
drwxr-xr-x 2 root root 4.0K Mar  6 06:23 bin' ']'

Component(s)

Continuous Integration, R

[kou]

It seems that reticulate creates ~/.cache/:

https://github.com/ursacomputing/crossbow/actions/runs/14256771156/job/39960758704#step:5:2464

/root/.cache
/root/.cache/R
/root/.cache/R/reticulate
/root/.cache/R/reticulate/uv
/root/.cache/R/reticulate/uv/python
...

Is it OK that we don't use reticulate for CRAN build?

diff --git a/r/tests/testthat/helper-skip.R b/r/tests/testthat/helper-skip.R
index bd29080848..ce2ad34e9f 100644
--- a/r/tests/testthat/helper-skip.R
+++ b/r/tests/testthat/helper-skip.R
@@ -57,6 +57,7 @@ skip_if_no_pyarrow <- function() {
     return()
   }
 
+  skip_on_cran()
   skip_on_linux_devel()
   skip_on_os("windows")
 

[jonkeane]

Aaah yes, we can skip those tests on cran for sure.

[kou]

OK! #46026 does it!

[kou]

Issue resolved by pull request 46026
#46026