Fixed Conda build by:

>> Setting the condarc file to only use the
conda-forge channel

>> Use Miniforge3 instead of Miniconda3 with the
libmamba solver

.github/workflows/conda_build.yml

@@ -13,24 +13,46 @@ jobs:
         shell: bash -l {0}
     steps:
       - uses: actions/checkout@v4
+
+      # Step to create a custom condarc.yml before setting up conda
+      - name: Create custom conda config file
+        run: |
+          RUNNER_CWD=$(pwd)
+          echo "channels:" > $RUNNER_CWD/condarc.yml
+          echo "  - conda-forge" >> $RUNNER_CWD/condarc.yml
+          echo "show_channel_urls: true" >> $RUNNER_CWD/condarc.yml
+
       - name: Setup Conda
         uses: conda-incubator/setup-miniconda@v3
         with:
+          miniforge-variant: Miniforge3
+          miniforge-version: latest
+          use-mamba: true
+          condarc-file: condarc.yml
           auto-update-conda: false
-          conda-solver: libmamba
           auto-activate-base: true
           activate-environment: ""
+
       - name: Install Build Tools
-        run: conda install python anaconda-client conda-build
+        run: mamba install python anaconda-client conda-build
+
       - name: Configure Auto-Upload
         if: github.ref == 'refs/heads/stable'
         run: |
-          conda config --set anaconda_upload yes
+          mamba config --set anaconda_upload yes
+
       - name: Build Binary
         run: |
-          # set a default value to the conda_token if needed (like from forks)
-          : "${CONDA_TOKEN:=${{ secrets.ANACONDA_TOKEN }}}"
-          : "${CONDA_TOKEN:=default_value}"
+          # Set the CONDA_TOKEN environment variable
+          if [ -z "${{ secrets.ANACONDA_TOKEN }}" ]; then
+            export CONDA_TOKEN="default_value"
+          else
+            export CONDA_TOKEN="${{ secrets.ANACONDA_TOKEN }}"
+          fi
+
           echo "CONDA_TOKEN=$CONDA_TOKEN" >> $GITHUB_ENV
-          conda config --add channels conda-forge
+      
+          # Build the Conda binary
           conda-build --token "$CONDA_TOKEN" --user rmg .conda
+
+