Remove defaults

Author: SilkeSchomann

.github/actions/publish-package/action.yml

@@ -27,6 +27,7 @@ runs:
       mamba install -c conda-forge mamba conda-build anaconda-client conda-verify boa
       conda config --add channels mantid/label/nightly
       conda config --add channels mantid
+      conda config --remove channels defaults
 
   - name: Build package
     shell: bash -l {0}

.github/workflows/unit_tests.yml

@@ -25,7 +25,7 @@ jobs:
 
       - name: Install Mantid
         run: |
-          conda install -c mantid/label/nightly mantid mantidqt
+          mamba install -c mantid/label/nightly mantid mantidqt
 
       - name: Run Tests and Coverage
         run: |

environment.yml

@@ -3,6 +3,7 @@ channels:
   - conda-forge
   - mantid
   - mantid/label/nightly
+  - nodefaults
 dependencies:
   - coverage
   - coveralls