pixi: Don't use activate-environment

Author: jorisv

.github/workflows/macos-linux-windows-conda.yml

@@ -71,10 +71,10 @@ jobs:
         pixi-version: v0.31.0
         cache: true
         environments: ${{ matrix.environment }}
-        activate-environment: true
 
     - name: Build EigenPy [MacOS/Linux]
       if: contains(matrix.os, 'ubuntu') || contains(matrix.os, 'macos')
+      shell: pixi run -e ${{ matrix.environment }} bash -el {0}
       env:
         CMAKE_BUILD_PARALLEL_LEVEL: 4
         EIGENPY_BUILD_TYPE: ${{ matrix.build_type }}
@@ -84,6 +84,7 @@ jobs:
 
     - name: Build EigenPy [Windows]
       if: contains(matrix.os, 'windows')
+      shell: pixi run -e ${{ matrix.environment }} bash -el {0}
       env:
         CMAKE_BUILD_PARALLEL_LEVEL: 4
         CC: ${{ matrix.compiler }}