Provide GitHub issue template to report CI failures.

.github/ISSUE_TEMPLATE/ci-failure.md

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+---
+name: CI Failure
+about: Report a continuous integration test failure
+title: '[CI] Brief description of the failing test/component'
+labels: ['ci', 'bug']
+assignees: ''
+---
+
+## Summary
+
+<!-- Provide a brief description of the CI failure -->
+
+**Failing test/component:** `[test_name_or_component]`
+
+**Failure observed in:**
+- https://github.com/rapidsai/cuml/actions/runs/XXXX
+
+## Environment
+
+<!-- Fill in the relevant environment details -->
+
+* **OS:** [e.g., ubuntu-20.04, windows-latest, macos-latest]
+* **Python version:** [e.g., 3.8, 3.9, 3.10, 3.11]
+* **CUDA version:** [if applicable, e.g., 11.8, 12.1]
+* **GPU:** [if applicable, e.g., V100, A100, CPU-only]
+* **Dependencies:** [e.g., oldest-deps, latest-deps, specific versions]
+
+## Test Details
+
+<!-- Please provide the following information about the test failure. -->
+
+- **Test file:** `[path/to/test_file.py]`
+- **Test name:** `[test_function_name]`
+- **Error message:**
+  ```
+  # Paste the relevant error message or traceback here
+  ```
+
+<!-- Add any other details about the failure if helpful (e.g., summary, logs, etc.) -->
+
+## Root Cause Analysis
+
+<!-- If known, describe any suspected causes or contributing factors to the failure.
+     This section can be left blank if the root cause is unknown. -->