Add nightly building to unittests.yml #265

Job	Run time
data	1s
compile_glecs (linux, x86_64, libglecs.linux.template_debug.x86_64.so, ubuntu-latest)	15s
compile_glecs (macos, x86_64, libglecs.macos.template_debug.x86_64.dylib, macos-13)	36s
compile_glecs (windows, windows, x86_64, libglecs.windows.template_debug.x86_64.dll, windows-latest)	2m 5s
run_test_suite (ubuntu-latest, bin.linux_x86_64.3c4ef9200452b97f336289e94bf45e916ff6d98942fc5dff7...	40s
run_test_suite (macos-13, bin.macos_x86_64.15fafb083832d78cabd508f83f09cfbaf0299a19980a81936e9db9...	1m 17s
run_test_suite (windows-latest, bin.windows_x86_64.2094ef88376bf7e2670c1836f018f24611e75a339f1bed...	1m 7s
update_nightly	0s
	6m 1s

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