Fix: [Actions] circumvent Windows tar warning about read-only files #8524
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Motivation / Problem
Our CI is almost completely clean of any warnings, except for something that is not in our own code base: "restore-cache" step on Windows for "run-vcpkg". This resolves that issue, by introducing a small hack.
Description
Windows tar returns "Can't unlink already-existing object" when
restoring a git clone with "restore-cache" operations. GNU tar
doesn't have this issue.
Limitations
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.