cf-6221 (draft) - #42

✅ 00:11 clone
✅ 00:01 sysinfo
✅ 00:13 ccache
✅ 00:01 setup_additional_packages
✅ 00:01 setup
✅ 02:18 gcc_warning
✅ 02:17 gcc_a_warning
✅ 02:49 clang_warning
✅ 02:37 clang_a_warning
✅ 04:36 mingw_cross_warning
✅ 00:39 docs_build
✅ 00:52 headers_headerscheck
✅ 00:42 headers_cpluspluscheck
✅ 00:08 Upload 'ccache' cache