Update main.yml

Author: mcbarton

.github/workflows/main.yml

@@ -207,12 +207,13 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-
+            
       - name: install mamba
         uses: mamba-org/setup-micromamba@main
         with:
-          init-shell: >-
-            ${{ matrix.micromamba_shell_init }}
+          environment-file: environment-wasm-build.yml
+          init-shell: ${{ matrix.micromamba_shell_init }}
+          environment-name: xeus-cpp-wasm-build
 
       - name: Setup default Build Type on *nux
         if: ${{ runner.os != 'windows' }}
@@ -240,9 +241,10 @@ jobs:
           mkdir build
           pushd build
 
+          export BUILD_PREFIX=$MAMBA_ROOT_PREFIX/envs/xeus-cpp-wasm-build
           export PREFIX=$MAMBA_ROOT_PREFIX/envs/xeus-cpp-wasm-host 
           echo "PREFIX=$PREFIX" >> $GITHUB_ENV
-          export SYSROOT_PATH=$HOME/emsdk/upstream/emscripten/cache/sysroot
+          export SYSROOT_PATH=$BUILD_PREFIX/opt/emsdk/upstream/emscripten/cache/sysroot
 
           emcmake cmake \
             -DCMAKE_BUILD_TYPE=Release                        \