fix: run makepkg as non-root user during AUR deployment

Author: frequency403

.github/workflows/staging.yml

@@ -87,7 +87,7 @@ jobs:
           cp $GITHUB_WORKSPACE/openssh-gui-git/PKGBUILD .
 
           docker run --rm -v "$(pwd)":/pkg -w /pkg archlinux:latest \
-          bash -c "pacman -Sy --noconfirm --needed pacman && makepkg --printsrcinfo > .SRCINFO"
+          bash -c "useradd -m builder && chown -R builder /pkg && su builder -c 'makepkg --printsrcinfo > .SRCINFO'"
       
           git config user.name "${{ github.repository_owner }}"
           git config user.email "${{ github.repository_owner }}@users.noreply.github.com"