test with mamba with shell init

.github/workflows/jobs.yml

@@ -47,6 +47,7 @@ jobs:
       run: |
         conda activate test
         mamba shell init --shell bash --root-prefix=~/.local/share/mamba
+        mamba shell reinit --shell bash
         mamba create -n pytest python=3.${{matrix.python-minor-version}} qgis=3.${{matrix.qgis-minor-version}} --yes
         mamba activate pytest
         mamba install --file requirements.txt --yes