Update build-v2.yml

.github/workflows/build-v2.yml

@@ -13,6 +13,7 @@ on:
 
 env:
   BUILD_TYPE: Debug
+  ROOTFS: /path/to/sysroot  # Define the ROOTFS environment variable
 
 jobs:
   build:
@@ -42,6 +43,7 @@ jobs:
     - name: Configure CMake for ARM32
       working-directory: ${{github.workspace}}/build
       run: |
+        export ROOTFS=/  # Ensure ROOTFS is exported for the build environment
         cmake .. -DCMAKE_TOOLCHAIN_FILE=${{github.workspace}}/cmake/Toolchain-cross-armhf.cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE
 
     - name: Build