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Christoph Reiter b5710ac4f4 CI: don't set BOOST_ROOT to an empty string This was initially added in `eb76ba7031` to avoid picking it up from azure/gha images. Looks like it is no longer set for some time now though: https://github.com/actions/runner-images/pull/540 so should no longer be needed. The empty string makes some meson tests fail which expect a path. A recent msys2-runtime change now lets empty env vars through to child processes whereas before they would get filtered out, which is why this worked before.		2 years ago
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ISSUE_TEMPLATE	…
workflows	CI: don't set BOOST_ROOT to an empty string	2 years ago
codecov.yml	…