Attempt to fix phar workflow

Author: floriankraemer

.github/workflows/phar-build.yaml

@@ -31,6 +31,7 @@ jobs:
       run: |
         mkdir -p tools
         curl -Ls https://github.com/box-project/box/releases/download/4.6.6/box.phar -o tools/box
+        chmod +x tools/box.phar
 
     - name: Build PHAR
       run: composer build-phar