nixos/snipe-it: clear and rebuild caches on startup (#402827)

nixos/modules/services/web-apps/snipe-it.nix

···
               sed -i 's/APP_KEY=/APP_KEY=base64:/' "${cfg.dataDir}/.env"
           fi
 
-          # purge cache
-          rm "${cfg.dataDir}"/bootstrap/cache/*.php || true
+          # pruge and rebuild caches
+          ${lib.getExe artisan} optimize:clear
+          ${lib.getExe artisan} optimize
 
           # migrate db
           ${lib.getExe artisan} migrate --force