auto-close bugs violating the issue template

[ci skip]

.github/ISSUE_TEMPLATE/bug.md

@@ -5,6 +5,7 @@ labels: type:bug
 ---
 
 <!--
+⚠️⚠️⚠️ READ CAREFULLY ⚠️⚠️⚠️
 
 Do you want to ask a QUESTION? Are you looking for SUPPORT?
 We're happy to help you via our support channels! Please read: https://github.com/cryptomator/cryptomator/blob/develop/SUPPORT.md
@@ -13,7 +14,9 @@ By filing an issue, you are expected to comply with our code of conduct: https:/
 
 Of course, we also expect you to search for existing similar issues first! ;) https://github.com/cryptomator/cryptomator/issues?q=
 
+⚠️ IMPORTANT: If you don't stick to this template, the issue will get closed. To proof that you read this, please remove the X from the following line:
 -->
+<!-- oooXooo -->
 
 ### Description
 

.github/workflows/triageBugs.yml

@@ -0,0 +1,25 @@
+name: Bug Report Triage
+
+on:
+  issues:
+    types: [opened]
+
+jobs:
+  closeTemplateViolation:
+    name: Close bug reports that violate the issue template
+    runs-on: ubuntu-latest
+    steps:
+      - if: |
+          contains(github.event.issue.labels.*.name, 'type:bug')
+          && (
+            !contains(github.event.issue.body, '<!-- oooooo -->')
+            || !contains(github.event.issue.body, '### Description')
+          )
+        name: Close Issue
+        uses: peter-evans/close-issue@v1
+        with:
+          comment: |
+            This bug report did ignore our issue template. 😞
+            Auto-closing this issue, since it is most likely not useful.
+
+            _This decision was made by a bot. If you think the bot is wrong, let us know and we'll reopen this issue._