Resolve "ArchLinux package script"

Closes #169 (closed)

.gitlab-ci.yml

 stages:
     - no_ci
+    - package
     - fmt
     - tests
     - clippy
-    - package
     - publish_crate
     - publish_doc 
     - prerelease
@@ -195,7 +195,9 @@ package:test:lin64:arch:
     refs:
       - tags
   script:
-    - bash "release/arch/linux-x64/build-arch.sh" "$(date +%Y%m%d).$(date +%H%M).$(date +%S)"
+    - useradd --no-create-home --shell=/bin/false builduser && usermod -L builduser
+    - 'echo "builduser ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers'
+    - sudo -u builduser -n PATH=$PATH:/root/.cargo/bin/ bash "release/arch/linux-x64/build-arch.sh" "$(date +%Y%m%d).$(date +%H%M).$(date +%S)"
   artifacts:
     paths:
       - work/bin/