set up dev env with conda?

.github/workflows/windows_ci.yml

@@ -31,13 +31,13 @@ jobs:
     # - name: Install requirements
     #   run: |
     #     python -m pip install -r etc/requirements_build.in -c etc/requirements_locked.txt
+    - uses: ilammy/msvc-dev-cmd@v1
     - name: Init Conda in Powershell
       run: |
         C:\Miniconda\condabin\conda.bat init powershell
     - name: Install scientific python requirements
       run: |
         conda create -y --name test python=${{matrix.python-version}} pip pandas=0.22.0 numpy=1.19.1 scipy=1.5.0 cython=0.29.21
-    - uses: ilammy/msvc-dev-cmd@v1
     - name: Install TA lib
       run: |
         (New-Object Net.WebClient).DownloadFile('http://prdownloads.sourceforge.net/ta-lib/ta-lib-0.4.0-msvc.zip', 'ta-lib-0.4.0-msvc.zip')