Configure default shell per OS (#2182)

Author: antonwolfy

.github/workflows/conda-package.yml

@@ -337,6 +337,10 @@ jobs:
 
     runs-on: ${{ matrix.os }}
 
+    defaults:
+      run:
+        shell: ${{ matrix.os == 'windows-2019' && 'cmd /C CALL {0}' || 'bash -el {0}' }}
+
     continue-on-error: true
 
     if: |