Merge pull request #41 from sunpy/fix-circle2

use sh not bash because nixos lol

tox.ini

@@ -29,13 +29,13 @@ extras =
 setenv =
     devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
     PYTEST_COMMAND = pytest -v -s -raR --pyargs mpl_animators --cov-report=xml --cov=mpl_animators --cov-config={toxinidir}/setup.cfg {toxinidir}/docs
-allowlist_externals = /bin/bash
+allowlist_externals = /bin/sh
 commands =
     pip freeze
     !figure: {env:PYTEST_COMMAND} {posargs}
-    figure: /bin/bash -c "mkdir -p ./figure_test_images; python -c 'import matplotlib as mpl; print(mpl.ft2font.__file__, mpl.ft2font.__freetype_version__, mpl.ft2font.__freetype_build_type__)' > ./figure_test_images/figure_version_info.txt"
-    figure: /bin/bash -c "pip freeze >> ./figure_test_images/figure_version_info.txt"
-    figure: /bin/bash -c "cat ./figure_test_images/figure_version_info.txt"
+    figure: /bin/sh -c "mkdir -p ./figure_test_images; python -c 'import matplotlib as mpl; print(mpl.ft2font.__file__, mpl.ft2font.__freetype_version__, mpl.ft2font.__freetype_build_type__)' > ./figure_test_images/figure_version_info.txt"
+    figure: /bin/sh -c "pip freeze >> ./figure_test_images/figure_version_info.txt"
+    figure: /bin/sh -c "cat ./figure_test_images/figure_version_info.txt"
     figure: python -c "import mpl_animators.tests.helpers as h; print(h.get_hash_library_name())"
     figure: {env:PYTEST_COMMAND} --mpl --mpl-generate-summary=html --mpl-baseline-path=https://raw.githubusercontent.com/sunpy/sunpy-figure-tests/mpl-animators-main/figures/{envname}/ {posargs}