gitlab/issue_template: add confidential issue note
With the new Active Community Members role (postmarketos.org!261 (merged)), a lot of people can read confidential pmaports issues too. This might be unexpected, so add a note to the issue template.
With the new Active Community Members role (postmarketos.org!261 (merged)), a lot of people can read confidential pmaports issues too. This might be unexpected, so add a note to the issue template.