fix extract

.github/workflows/create_release.yml

diff --git a/.github/workflows/create_release.yml b/.github/workflows/create_release.yml
index 02014f8..813e3a4 100644
--- a/.github/workflows/create_release.yml
+++ b/.github/workflows/create_release.yml
@@ -128,13 +128,11 @@
     - name: download sysroot
       run: |
         wget https://wasm.storage.googleapis.com/sysroot_debian_stretch_amd64_v2.tar.xz
-        tar xaf sysroot_debian_stretch_amd64_v2.tar.xz
-        pwd
-        ls
+        mkdir sysroot && tar xaf sysroot_debian_stretch_amd64_v2.tar.xz -C sysroot
 
     - name: cmake
       run: |
-        cmake . -G Ninja -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER=clang -DCMAKE_AR=llvm-ar -DCMAKE_SYSROOT=$(pwd)/sysroot_debian_stretch_amd64_v2 -DCMAKE_BUILD_TYPE=Release -DBUILD_STATIC_LIB=ON -DCMAKE_INSTALL_PREFIX=install -DBYN_ENABLE_LTO=ON
+        cmake . -G Ninja -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER=clang -DCMAKE_AR=llvm-ar -DCMAKE_SYSROOT=$(pwd)/sysroot -DCMAKE_BUILD_TYPE=Release -DBUILD_STATIC_LIB=ON -DCMAKE_INSTALL_PREFIX=install -DBYN_ENABLE_LTO=ON
 
     - name: build
       run: |