I wouldn't recommend hard coding credentails into a script, best to obfuscate the string using something like below.

https://github.com/brysontyrrell/EncryptedStrings

As far as making the script be a clickable executable. Automator or shortcuts may work for this; depending on the target version of macOS. The most straightforward way would be t o append dot command to the shell script, this would cause it to run when double clicked if permissions are set correctly. ie local admin.command

If you're looking to manage admin temporary admin rights.  I'd either enable Jamf's makemeadmin script in self service, or look into https://github.com/SAP/macOS-enterprise-privileges

Thats what i`m looking for - thanx man