use setup-micromamba on mac

Author: wpbonelli

action.yml

@@ -42,6 +42,15 @@ runs:
         path: ${{ env.ONEAPI_ROOT }}
         key: ${{ runner.os }}-${{ inputs.compiler }}-${{ inputs.version }}-${{ steps.get-date.outputs.date }}
 
+    - uses: mamba-org/setup-micromamba@v1
+      if: runner.os == 'macOS' && contains(inputs.compiler, 'lfortran')
+      with:
+        init-shell: >-
+          bash
+          powershell
+          cmd.exe
+        post-cleanup: 'all'
+
     # Set up the selected toolchain or compiler
     - name: Setup toolchain
       id: setup

setup-fortran.sh

@@ -25,11 +25,6 @@ install_environment_modules_apt() {
   echo "Environment modules set up completed."
 }
 
-install_micromamba_brew() {
-  brew install micromamba
-  micromamba shell init
-}
-
 install_gcc_brew()
 {
   # check if gcc preinstalled via brew
@@ -618,7 +613,6 @@ install_lfortran_w()
 install_lfortran_m()
 {
   local version=$1
-  install_micromamba_brew
   export CC="gcc"
   export CXX="g++"
   export CONDA_ROOT_PREFIX=$MAMBA_ROOT_PREFIX