github: use the new issue template (NixOS#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.md

@@ -8,5 +8,4 @@
 
 ## Technical details
 
-Please run `nix-shell -p nix-info --run "nix-info -m"` and paste the
-results.
+Please run `nix run nixpkgs.nix-info -c nix-info -m` and paste the result.

.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:
+```

.github/ISSUE_TEMPLATE/packaging_request.md

@@ -0,0 +1,18 @@
+---
+name: Packaging requests
+about: For packages that are missing
+title: ''
+labels: '0.kind: packaging request'
+assignees: ''
+
+---
+
+**Project description**
+_describe the project a little_
+
+**Metadata**
+
+* homepage URL:
+* source URL:
+* license: mit, bsd, gpl2+ , ...
+* platforms: unix, linux, darwin, ...

.github/ISSUE_TEMPLATE/security.md

@@ -0,0 +1,27 @@
+---
+name: Security report
+about: Report security issues
+title: ''
+labels: '1.severity: security'
+assignees: ''
+
+---
+
+To privately report a security issue with NixOS, Nix, and its ecosystem,
+please email a member of the NixOS Security Team and we will ensure the issue
+is handled. Our responses will be signed with our GPG keys:
+https://nixos.org/nixos/security.html
+
+**Report**
+
+CVE:
+
+**Metadata**
+
+Maintainer information:
+```yaml
+# a list of nixpkgs attributes affected by the problem
+attribute:
+# a list of nixos modules affected by the problem
+module:
+```