GH Actions: cygwin: Move rpy2 to TARGETS_OPTIONAL

[mkoeppe]

As a follow up to #31409, which made r and rpy2 optional.
We move the rpy2 from TARGETS to TARGETS_OPTIONAL so that build errors do not block the later test stages.

Depends on #31409
Depends on #31064

CC: @kliem @embray @jhpalmieri

Component: porting: Cygwin

Branch/Commit: u/mkoeppe/gh_actions__cygwin__move_rpy2_to_targets_optional @ 52792d4

Reviewer: Michael Orlitzky

Issue created by migration from https://trac.sagemath.org/ticket/31438

[mkoeppe]

Branch: u/mkoeppe/gh_actions__cygwin__move_rpy2_to_targets_optional

[mkoeppe]

Commit: 732ec63

[mkoeppe]

New commits:

b2d4ab8	build/pkgs/{r,rpy2}: Downgrade to optional
8732076	src/sage/repl/ipython_tests.py: Mark R interface tests # optional - rpy2
dbdf084	src/sage/structure/sage_object.pyx: Mark R interface test # optional - rpy2
737b21c	src/sage/stats/r.py: Mark all 2 doctests in this file as # optional - rpy2
4403924	src/sage/interfaces/r.py: Mark all tests # optional - rpy2
405ebb9	More # optional - rpy2
bc2f54d	Merge branch 't/31409/cygwin_standard__r_build_fails_____downgrade_r__rpy2_to_optional' into t/31438/gh_actions__cygwin__move_rpy2_to_targets_optional
732ec63	.github/workflows/ci-cygwin*.yml: Move rpy2 to TARGETS_OPTIONAL

[mkoeppe]

Changed dependencies from #31409 to #31409, #31064

[sagetrac-git]

Changed commit from 732ec63 to f99cbeb

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. Last 10 new commits:

cf31b79	Fixup after cherry-pick
073124c	Merge branch 't/31084/makefile__add__ptest__targets_that_do_not_depend_on_the_docbuild' into t/31064/ci_cygwin__yml__adjust_to_new_script_packages__bootstrap___prereq
8769bd6	.github/workflows/ci-cygwin-*.yml: Separate docbuild and ptest
3826222	Fix up stage iv
598b0c2	local-cygwin-choco: Do not pass through PATH, use full pathname of choco instead
d65299c	Merge branch 't/29124/script-packages-prereq-toolchain-bootstrap' into t/31064/ci_cygwin__yml__adjust_to_new_script_packages__bootstrap___prereq
a5e4051	Merge branch 't/30944/tox__improve_local_sudo_ubuntu_standard' into t/31064/ci_cygwin__yml__adjust_to_new_script_packages__bootstrap___prereq
42f4458	Merge tag '9.3.beta7' into t/31064/ci_cygwin__yml__adjust_to_new_script_packages__bootstrap___prereq
2f62998	Merge branch 't/31064/ci_cygwin__yml__adjust_to_new_script_packages__bootstrap___prereq' into t/31438/gh_actions__cygwin__move_rpy2_to_targets_optional
f99cbeb	.github/workflows/ci-cygwin*.yml: Move rpy2 to TARGETS_OPTIONAL

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

Reviewer: https://github.com/mkoeppe/sage/actions/runs/606112478

[sagetrac-git]

Changed commit from f99cbeb to 52792d4

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

b7c1576	Merge tag '9.3.beta8' into t/31409/cygwin_standard__r_build_fails_____downgrade_r__rpy2_to_optional
ce3b35f	More # optional - r
52792d4	Merge branch 't/31409/cygwin_standard__r_build_fails_____downgrade_r__rpy2_to_optional' into t/31438/gh_actions__cygwin__move_rpy2_to_targets_optional

[dimpase]

comment:9

Cygwin build errors out while building Pynac

[mkoeppe]

comment:10

Replying to @dimpase:

Cygwin build errors out while building Pynac

Not this ticket's fault. The test runs are for the Singular upgrade in #25993

[mkoeppe]

Changed reviewer from https://github.com/mkoeppe/sage/actions/runs/606112478 to none

[mkoeppe]

Changed author from Matthias Koeppe to none

[mkoeppe]

comment:11

Not needed any more now that the r/rpy2 crisis has been averted

[orlitzky]

Reviewer: Michael Orlitzky