update issue template (#554)

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -22,6 +22,13 @@ body:
       options:
         - label: I have read the documentation
           required: true
+  - type: checkboxes
+    attributes:
+      label: Is your issue present in the nightly release?
+      description: Please test the [nightly](https://github.com/LizardByte/Sunshine/releases/tag/nightly-dev) release
+      options:
+        - label: This issue is present in the nightly release
+          required: true
   - type: textarea
     id: description
     attributes: