Add git lfs uninstall --local before checkout on self-hosted runners

Cleans up stale LFS hooks left by previous jobs on shared self-hosted
runners, preventing "Hook already exists: pre-push" failures.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jiaenren

.github/workflows/coverage.yaml

@@ -107,6 +107,9 @@ jobs:
           echo "Docker version: $(docker --version)"
           echo "Git LFS version: $(git-lfs --version)"
 
+      - name: Clean up stale LFS hooks
+        run: git lfs uninstall --local || true
+
       - name: Checkout
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with:

.github/workflows/pr-checks.yaml

@@ -188,6 +188,9 @@ jobs:
           echo "Docker version: $(docker --version)"
           echo "Git LFS version: $(git-lfs --version)"
 
+      - name: Clean up stale LFS hooks
+        run: git lfs uninstall --local || true
+
       - name: Checkout
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with: