wolfi-baselayout: set /var/tmp permissions to 1777#78636
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/var/tmp was being created via mkdir -p with default 0755 permissions. Every major distro (Alpine, Ubuntu, Debian, Fedora, Arch) sets /var/tmp to 1777 (drwxrwxrwt), same as /tmp, since it is a shared temporary directory that any user should be able to write to. This was already fixed for /tmp in 0744eb9 but /var/tmp was missed. The incorrect permissions caused failures in images like selenium-standalone-chromium where Xvfb uses -fbdir /var/tmp and the non-root seluser could not write to it. Fixes: chainguard-dev/customer-issues#3131
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Summary
/var/tmpwas being created viamkdir -pwith default0755permissions, but every major distro (Alpine, Ubuntu, Debian, Fedora, Arch) sets it to1777(drwxrwxrwt), same as/tmp./tmpin 0744eb9 but/var/tmpwas missed.selenium-standalone-chromiumwhere Xvfb uses-fbdir /var/tmpand the non-rootselusercould not write to it, resulting in a cascade of failures (Xvfb → VNC → ChromeDriver → SeleniumGuardedRunnableexception).Test plan
/var/tmphas1777permissions in a rebuilt imageselenium-standalone-chromiumstarts without theGuardedRunnableerrorFixes: https://github.com/chainguard-dev/customer-issues/issues/3131
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