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actions/cache@v2 doesn't work on windows-2016 images, since those
contain the GNU tar, which cannot work with \ as path separator. This
was fixed in package @actions/cache v1.0.5, which is used by action
actions/cache@v2.1.4 [1][2].
In addition, it simply couldn't find tar.exe on those images thanks to
my action cleanup-path, which removed the corresponding directory (I
think it was Git's bin/) from PATH. It worked for windows-2019 images
thanks to them containing tar.exe in System32. Solved by turning
cleanup-path into a JavaScript action with a "post" step, which restores
the original PATH value.
[1]: https://github.com/actions/virtual-environments/issues/480
[2]: https://github.com/actions/toolkit/issues/632
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