ENH move to mamba

Author: beckermr

.ci_scripts/update_docs

@@ -3,7 +3,7 @@
 set -ex
 
 git checkout -b new_site_content
-conda env create -f ./.ci_scripts/environment.yml
+mamba env create -f ./.ci_scripts/environment.yml
 conda activate conda-forge-docs
 
 pushd newsfeed

.github/workflows/deploy.yml

@@ -16,10 +16,12 @@ jobs:
 
       - uses: conda-incubator/setup-miniconda@v2
         with:
-          python-version: 3.7
+          python-version: 3.8
           channels: conda-forge,defaults
           channel-priority: strict
           show-channel-urls: true
+          miniforge-version: latest
+          miniforge-variant: Mambaforge
 
       - name: configure conda
         shell: bash -l {0}