github: use the new issue template (#64983)

Create new categories for the issues:

* Bug report
* Packaging request
* Security

Add metadata information to the issues so that we may match issues to
maintainers using a bot in the future.

The old `.github/ISSUE_TEMPLATE.md` is being used by the "Open a regular
issue." link.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,37 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: '0.kind: bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. ...
+2. ...
+3. ...
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.
+
+**Metadata**
+Please run `nix run nixpkgs.nix-info -c nix-info -m` and paste the result.
+
+Maintainer information:
+```yaml
+# a list of nixpkgs attributes affected by the problem
+attribute:
+# a list of nixos modules affected by the problem
+module:
+```