If the two systems are not integrated, have you considered using the standard "plain" web links from the Jira work item to the GitHub bug?
Web links are not very smart, but they allow using any URL, including GitHub bug URLs.
Best practice I can give you, integrate.
You can create a free text field or a URL field to place information.
Then I would suggest URL field, to provide the url to the Git issue, maybe even with a screen on the Done transition with this field set as mandatory or a validator in the workflow to make sure the field is provided.
You could also look at API options, to fill a text field with the Git issue ID, but then you would need to know the related jira owrk item where to set this field.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.