Added variable os_immutable_fs to oshardening#669

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millerthegorilla wants to merge 3 commits intodev-sec:masterfrom millerthegorilla:os_immutable_fs

+16-1

Commits on May 3, 2023

Added variable os_immutable_fs to oshardening to compensate for immutable filesystems, in particular ostree systems. Updated oshardening/README.md to reflect this
millerthegorilla
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Commits on May 10, 2023

added extra check that was missing from initial commit
millerthegorilla
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Commits on Jun 23, 2023

removed trailing space
millerthegorilla
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