diff --git a/.github/workflows/pr-test.yml b/.github/workflows/pr-test.yml
index 3ba34f575..dd9810fe8 100644
--- a/.github/workflows/pr-test.yml
+++ b/.github/workflows/pr-test.yml
@@ -110,7 +110,11 @@ jobs:
     steps:
       - name: Cleanup
         run: |
-          sudo rm -rf $GITHUB_WORKSPACE/* || true
+          if [ -d "$GITHUB_WORKSPACE" ]; then
+            sudo rm -rf "$GITHUB_WORKSPACE"/* || true
+          else
+            echo "$GITHUB_WORKSPACE does not exist, nothing to clean"
+          fi
 
       - uses: actions/checkout@v4
         with:
diff --git a/sgl-kernel/build.sh b/sgl-kernel/build.sh
index d2cd7f297..be1435300 100755
--- a/sgl-kernel/build.sh
+++ b/sgl-kernel/build.sh
@@ -142,7 +142,7 @@ docker run --rm \
    ccache -sV || true
    echo \"\"
 
-   yum install numactl-devel -y && \
+   yum install numactl-devel -y --nogpgcheck && \
    yum install libibverbs -y --nogpgcheck && \
    ln -sv /usr/lib64/libibverbs.so.1 /usr/lib64/libibverbs.so && \
    ${PYTHON_ROOT_PATH}/bin/${TORCH_INSTALL} && \