Try fixing conda on Windows

.github/workflows/test.yml

@@ -23,26 +23,40 @@ jobs:
       matrix:
         os: [windows-latest]
 
+    defaults:
+      run:
+        shell: powershell
+
     steps:
     - uses: actions/checkout@v2
-    - run: |
+    - shell: bash
+      run: |
         npm install
         npm run all
     - uses: ./
+    - name: init powershell
+      run: conda init --system powershell
     - name: Run conda list
       run: conda list
-    - name: init pwsh
-      run: conda init --system powershell
-    - name: Install Python
-      shell: powershell
-      # run: echo "%PATH%" && CALL activate.bat base && conda info && echo "%PATH%"
+    - name: Install stuff
       run: |
-        conda activate base
+        $ErrorActionPreference = 'stop';
         conda env list
-        echo "$env:path"
-    - name: Install stuff
-      run: conda activate base && mamba.bat install -y -c conda-forge xtensor
+        get-command mamba
+        mamba --version
+        write-host 'AAAAA'
+        $proc = Start-Process mamba -ArgumentList 'install','-y','-c conda-forge','xtensor' -NoNewWindow -Wait -PassThru;
+        write-host "EXITCODE: ${proc.ExitCode}"
+        write-host $proc.StandardOutput
+        write-host $proc.StandardError
+        write-host 'BBBBB'
+        conda list
+        write-host 'CCCCC'
+        mamba install --yes conda=4.8.2
+        write-host 'DDDDD'
     - name: Install Notebook and widgets
-      run: mamba.bat install -y -c conda-forge notebook ipywidgets
+      run: |
+        mamba install -y -c conda-forge xtensor
+        mamba install -y -c conda-forge notebook ipywidgets
     - name: List the packages
-      run: mamba.bat list
+      run: mamba list