chore: Add task to add-product issue template (#892)

This adds a task which states that the badges in
the README file need to be updates by running the
appropriate script.

Author: Techassi

.github/ISSUE_TEMPLATE/add-product.md

@@ -23,6 +23,7 @@ assignees: ''
 - [ ] Add a new `dev_<PRODUCT>.yml` GitHub Action workflow in the
       `.github/workflows` folder. Use existing local action whenever possible
       or consider creating a new one when there is no fitting action available.
+- [ ] Run `.scripts/update_readme_badges.sh` to generate the new status badge.
 ```
 
 _Please consider updating this template if these instructions are wrong, or