Only accept GH issues numbered 32426 or above

[menkotoglou]

Fixes #504.

Iterates through the template file to find the gh-issue line and checks number if it's in the accepted issue number range.

This is how an unsuccessful attempt looks like:

❯ /bin/python3 /path/core-workflow/blurb/blurb.py

Error: The gh-issue number should be 32426 or above.

[Hit return to retry (or Ctrl-C to abort)> 

[ghost]

The following commit authors need to sign the Contributor License Agreement:

• menelaos.kotoglou@numberly.com

Click the button to sign: