tox / GH Actions: Disable testsuites of packages depending on pip packages (pytest, ...)

[mkoeppe]

(from #30556)

... because we still don't have openssl on some platforms and so can't install pip packages.

We also make two minor fixes to package dependencies that are conditionalized on SAGE_CHECK:

• sage_sws2rst was using the wrong variable for the conditionalization
• rpy2 likes to have ipython available for tests (​https://github.com/mkoeppe/sage/runs/1561098042):

  _____________ ERROR collecting src/rpy2/tests/ipython/test_html.py _____________
  ImportError while importing test module '/sage/local/var/tmp/sage/build/rpy2-3.3.6/src/rpy2/tests/ipython/test_html.py'.
  Hint: make sure your test modules/packages have valid Python names.
  Traceback:
  /usr/lib/python3.6/importlib/__init__.py:126: in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
  src/rpy2/tests/ipython/test_html.py:4: in <module>
      from rpy2.ipython import html
  src/rpy2/ipython/__init__.py:1: in <module>
      from . import rmagic
  src/rpy2/ipython/rmagic.py:89: in <module>
      from IPython.core import displaypub
  E   ModuleNotFoundError: No module named 'IPython'
  

[mkoeppe]

New commits:

​9ad611d	tox.ini, build/bin/write-dockerfile.sh: Add !sage_sws2rst, !rpy2 to SAGE_CHECK_PACKAGES
​48657d2	build/pkgs/sage_sws2rst/dependencies: Fix typo - use SAGE_CHECK_sage_sws2rst

[git]

Branch pushed to git repo; I updated commit sha1. Last 10 new commits:

​559dd8e	tox.ini (local-root): Pass --enable-build-as-root to configure
​a85f41c	tox.ini (local): Do not build the toolchain when posargs = config.status or posargs = configure
​1de912a	tox.ini (local-sudo): Run apt-get update with sudo
​3c7e5c4	tox.ini (local-root, local-sudo): Run output of sage-print-system-package-command through eval
​571cc49	Merge branch 't/30947/src_doc_bootstrap__simplify_by_using_new_options_of__sage__package_list_' into t/29124/script-packages-prereq-toolchain-bootstrap
​f7ff30c	Merge branch 't/29124/script-packages-prereq-toolchain-bootstrap' into t/30944/tox__improve_local_sudo_ubuntu_standard
​c529729	Merge commit '3bb309944b7e8542b2ac88ed3c9d9a60e68644d7' of git://trac.sagemath.org/sage into t/29124/script-packages-prereq-toolchain-bootstrap
​b73d6f0	Merge tag '9.3.beta4' into t/29124/script-packages-prereq-toolchain-bootstrap
​e9ca2c1	Merge branch 't/29124/script-packages-prereq-toolchain-bootstrap' into t/30944/tox__improve_local_sudo_ubuntu_standard
​380c718	Merge branch 't/30944/tox__improve_local_sudo_ubuntu_standard' into t/31062/tox___gh_actions__disable_testsuites_of_packages_depending_on_pip_packages__pytest_______if_there_is_no_ssl

[git]

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

​b25ea3b

build/pkgs/rpy2/dependencies: If SAGE_CHECK=yes, depend on ipython

[mkoeppe]

Let's please get this ticket in so that our CI runs work again normally

[gh-kliem]

LGTM.

[mkoeppe]

Thanks!