fix CI

Author: anutosh491

.github/workflows/main.yml

@@ -200,10 +200,8 @@ jobs:
         include:
           - name: ubu24
             os: ubuntu-24.04
-            micromamba_shell_init: bash
           - name: osx15-arm
             os: macos-15
-            micromamba_shell_init: bash
 
     steps:
       - uses: actions/checkout@v4
@@ -213,8 +211,9 @@ jobs:
       - name: install mamba
         uses: mamba-org/setup-micromamba@main
         with:
-          init-shell: >-
-            ${{ matrix.micromamba_shell_init }}
+          environment-file: environment-wasm-build.yml
+          init-shell: bash
+          environment-name: xeus-cpp-wasm-build
 
       - name: Setup default Build Type on *nux
         if: ${{ runner.os != 'windows' }}