Merge branch 'master' into bgruening-patch-2

Author: bgruening

.github/workflows/ci.yaml

@@ -23,7 +23,7 @@ jobs:
     - run: docker info
     - name: Build images
       run: |
-        mulled-build-files --check-published --singularity --namespace $MULLED_NAMESPACE --use-mamba  build-and-test ./combinations --verbose
+        mulled-build-files --check-published --singularity --namespace $MULLED_NAMESPACE build-and-test ./combinations --verbose
     - name: Upload images (if pushed to master branch)
       if: github.ref == 'refs/heads/master' && github.repository_owner == 'BioContainers'
       env: