Create archive tar with appropriate flags rather than chown #57
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In order to prevent file ownership issues when extracting the tarball, we were chowning all files to root before creating the tarball. Using chown on Windows in Cygywin in GitHub Actions is dicey, so instead, we use the appropriate tar flags to ensure all files have ownership by 0:0. When extracted, if extracting as a non-root user, since a non-root user can't create files they don't have access to, that user will end up owning the files.