Update create-latest-svc.sh to make it functional

[Jason-Clark-FG]

Some small tweaks (and additions) to update this script so it will work...

• Shebang was missing the bang,
• Modified shebang to use env to find bash #!/usr/bin/env bash
• Extended the bash options set -Eeo pipefail
• Detect if running as root or with sudo and exit
• Fix fatal function (cannot use () with function keyword)
• Fix double square bracket pattern matching =~ / for $runner_scope
• Fix single square bracket $RUNNER_TOKEN detection comparison operator == -> _
• Update curl flags to enable silent operation

Future nice to have would be to automatically remove the service if the -f flag is selected. After which it could automatically remove the ./runner directory.

Feel free to modify this as necessary. It was tested on an Ubuntu 22.04 LTS system.