Update conda-package-build.yml

Author: pradal

.github/workflows/conda-package-build.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       max-parallel: 3
       matrix:
-        os: [ macos-latest, windows-latest, linux-latest]
+        os: [ macos-latest, windows-latest, ubuntu-latest]
         python-minor-version: [7, 8, 9]
         isMaster:
           - ${{ github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/heads/dev') }}
@@ -51,7 +51,7 @@ jobs:
     - name: Build and Publish
       uses: openalea/[email protected]
       with:
-        conda: conda
+        conda: mamba
         mamba: true
         numpy: '21.6'
         python: ${{ matrix.python-minor-version }}