Use mamba-forge and mamba to install dependencies

.github/workflows/ci.yml

@@ -23,8 +23,9 @@ jobs:
         uses: conda-incubator/setup-miniconda@v2.0.1
         with:
           channels: conda-forge,bioconda,defaults
+          installer-url: https://github.com/conda-forge/miniforge/releases/download/4.11.0-0/Mambaforge-4.11.0-0-Linux-x86_64.sh
         # Conda-incubator uses 'test' environment by default.
       - name: install requirements
-        run: conda install -n test cromwell miniwdl wdl-aid
+        run: mamba install -n test cromwell miniwdl wdl-aid
       - name: run linting
         run: bash scripts/biowdl_lint.sh