Simplify build workflow for non-root runner

Runner now executes as builder user, so no su/chown/chmod needed.
makepkg runs directly without permission workarounds.

.gitea/workflows/build-and-publish.yaml

@@ -19,7 +19,6 @@ jobs:
           rm -rf repo
           git clone http://gitea:3000/nevaforget/moonarch-pkgbuilds.git repo
           cd repo
-          git config --global --add safe.directory "$(pwd)"
 
           CHANGED=$(git diff --name-only HEAD~1 HEAD | grep '/PKGBUILD$' | sed 's|/PKGBUILD||' || true)
 
@@ -30,14 +29,11 @@ jobs:
 
           echo "Changed packages: $CHANGED"
 
-          chown -R builder:builder .
-
           for pkg in $CHANGED; do
             echo "==> Building $pkg"
             cd "$pkg"
 
-            # Build package as non-root user
-            su builder -c "BUILDDIR=. makepkg -sfd --noconfirm"
+            makepkg -sfd --noconfirm
 
             # Find the built package file
             PKG_FILE=$(ls -t *.pkg.tar.zst 2>/dev/null | head -1)