Sign module

[plastikfan]

See:

• https://adamtheautomator.com/how-to-sign-powershell-script/
• https://www.hanselman.com/blog/signing-powershell-scripts
• https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_signing?view=powershell-7.1
• https://4sysops.com/archives/sign-your-powershell-scripts-to-increase-security/