ci(github): add automated duplicate issue checker and template safegu…

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -9,6 +9,14 @@ body:
         Thanks for taking the time to fill out this bug report!
 
         **💡 Tip:** See our [Troubleshooting Guide](https://docs.litellm.ai/docs/troubleshoot) for what information to include.
+  - type: checkboxes
+    id: duplicate-check
+    attributes:
+      label: Check for existing issues
+      description: Please search to see if an issue already exists for the bug you encountered.
+      options:
+        - label: I have searched the existing issues and checked that my issue is not a duplicate.
+          required: true
   - type: textarea
     id: what-happened
     attributes:

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -7,6 +7,14 @@ body:
     attributes:
       value: |
         Thanks for making LiteLLM better! 
+  - type: checkboxes
+    id: duplicate-check
+    attributes:
+      label: Check for existing issues
+      description: Please search to see if an issue already exists for the feature you are requesting.
+      options:
+        - label: I have searched the existing issues and checked that my issue is not a duplicate.
+          required: true
   - type: textarea
     id: the-feature
     attributes:

.github/workflows/check_duplicate_issues.yml

@@ -0,0 +1,29 @@
+name: Check Duplicate Issues
+
+on:
+  issues:
+    types: [opened, edited]
+
+jobs:
+  check-duplicate:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      contents: read
+    steps:
+      - name: Check for potential duplicates
+        uses: wow-actions/potential-duplicates@v1
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          label: potential-duplicate
+          threshold: 0.6
+          reaction: eyes
+          comment: |
+            **⚠️ Potential duplicate detected**
+
+            This issue appears similar to existing issue(s):
+            {{#issues}}
+            - [#{{number}}]({{html_url}}) - {{title}} ({{accuracy}}% similar)
+            {{/issues}}
+
+            Please review the linked issue(s) to see if they address your concern. If this is not a duplicate, please provide additional context to help us understand the difference.