Updated app bug report template (#11695)

.github/ISSUE_TEMPLATE/1-codex-app.yml

@@ -21,6 +21,13 @@ body:
       label: What subscription do you have?
     validations:
       required: true
+  - type: input
+    id: platform
+    attributes:
+      label: What platform is your computer?
+      description: |
+        For macOS and Linux: copy the output of `uname -mprs`
+        For Windows: copy the output of `"$([Environment]::OSVersion | ForEach-Object VersionString) $(if ([Environment]::Is64BitOperatingSystem) { "x64" } else { "x86" })"` in the PowerShell console
   - type: textarea
     id: actual
     attributes: