systemd warns if a service is marked executable, world-writable or world-inaccessible

Issue

• systemd will warn if it finds a service file that has an executable bit, permissions are overly permissive or non-accessible for other users

    Jul 30 16:09:37 server01 systemd[1]: Configuration file /etc/systemd/system/custom-service.service is marked executable. Please remove executable permission bits. Proceeding anyway.
    Jul 30 16:09:37 server01 systemd[1]: Configuration file /etc/systemd/system/custom-service.service is marked world-writable. Please remove world writability permission bits. Proceeding anyway.
    Jul 30 16:09:37 server01 systemd[1]: Configuration file /etc/systemd/system/custom-service.service is marked world-inaccessible. This has no effect as configuration data is accessible via APIs without restrictions. Proceeding anyway.