setup shell in build_windows step

drops conda activate commands

Author: ndgrigorian

.github/workflows/conda-package.yml

@@ -82,6 +82,9 @@ jobs:
   build_windows:
     runs-on: windows-latest
     timeout-minutes: 150
+    defaults:
+      run:
+        shell: cmd /C CALL {0}
 
     strategy:
       matrix:
@@ -107,7 +110,6 @@ jobs:
 
       - name: Install conda build
         run: |
-          conda activate
           conda install -y conda-build
           conda list -n base
 
@@ -133,7 +135,6 @@ jobs:
         env:
           OVERRIDE_INTEL_IPO: 1   # IPO requires more resources that GH actions VM provides
         run: |
-          conda activate
           # TODO: roll back use of Intel channel when 2025.1 is available on conda-forge
           conda build --no-test --python ${{ matrix.python }} --numpy 2.0 -c ${{ env.INTEL_CHANNEL }} -c conda-forge --override-channels conda-recipe