CI improvments

- Only build when PKGBUILD are changed
- Remove not needed chmod

.gitlab-ci.yml

@@ -13,7 +13,6 @@ makepkg:
     - pacman --sync --refresh --sysupgrade --noconfirm
     - pacman --sync --noconfirm base-devel devtools
     - useradd --home-dir /root --groups root,wheel --shell /bin/bash build
-    - chmod 770 /root
   script:
     - ulimit -c 0
     - sudo -u build -- makepkg --syncdeps
@@ -22,6 +21,9 @@ makepkg:
     expire_in: 1 week
     paths:
       - "*.pkg.tar.xz"
+  only:
+    changes:
+      - PKGBUILD
 
 commitpkg:
   stage: deploy