ci(pre-commit): run checks only on changed files in PR

Author: Shen7436

.github/workflows/pre-commit.yml

@@ -26,7 +26,17 @@ jobs:
       run: pip install codespell
 
     - name: Run pre-commit checks
-      run: pre-commit run --all-files
+      run: |
+        BASE_SHA=${{ github.event.pull_request.base.sha }}
+        HEAD_SHA=${{ github.event.pull_request.head.sha }}
+        CHANGED_FILES=$(git diff --name-only $BASE_SHA $HEAD_SHA | grep -E '\.(py|c|h|md|rst|yml)$' || true)
+        echo "Changed files:"
+        echo "$CHANGED_FILES" | tr ' ' '\n'
+        if [ -n "$CHANGED_FILES" ]; then
+          pre-commit run --files $CHANGED_FILES -v
+        else
+          echo "No matching files changed."
+        fi
 
     - name: Validate commit messages
       run: |