.github/ISSUE_TEMPLATE: Add an issue template for tracking (#316129)

.github/ISSUE_TEMPLATE/tracking_issue.md

@@ -0,0 +1,39 @@
+---
+name: Tracking issue
+about: Provide an overview on a multi-step effort
+title: 'Tracking issue: ISSUENAME'
+labels: '5.scope: tracking'
+assignees: ''
+
+---
+
+### Tracking description
+
+<!--
+Provide a brief summary of the project or multi-step effort. Explain why it is
+necessary and what the goals are.
+
+You may include way to reproduce the problem, screenshots or any information
+that you find relevant.
+-->
+
+#### Reference Issue(s)/PR(s)
+
+- ...
+
+### Follow-up issues/notes
+
+<!--
+List any follow-up issues that need to be addressed after the main tasks are
+completed, or any notes related to the project.
+-->
+
+#### Additional context
+Add any other context about the problem here.
+
+---
+
+Add a :+1: [reaction] to [issues you find important].
+
+[reaction]: https://github.blog/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/
+[issues you find important]: https://github.com/NixOS/nixpkgs/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc