test caching

.github/workflows/build-pages.yml

@@ -32,14 +32,34 @@ jobs:
           git clone "https://token:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git" .
         shell: bash
 
-      - name: create environment with mamba
+      - name: Setup Mambaforge
         uses: conda-incubator/setup-miniconda@v3
         with:
-          mamba-version: "*"
-          channels: conda-forge,defaults
-          auto-activate-base: false
+          miniforge-variant: Mambaforge
+          miniforge-version: latest
           activate-environment: rmarkdown-env
-          environment-file: .github/envs/environment.yml
+          use-mamba: true
+
+      - name: Get Date
+        id: get-date
+        run: echo "today=$(/bin/date -u '+%Y%m%d')" >> $GITHUB_OUTPUT
+        shell: bash
+
+      - name: Cache Conda env
+        uses: actions/cache@v3
+        with:
+          path: ${{ env.CONDA }}/envs
+          key:
+            conda-${{ runner.os }}--${{ runner.arch }}--${{steps.get-date.outputs.today }}-${{hashFiles('etc/example-environment-caching.yml') }}-${{ env.CACHE_NUMBER}}
+        env:
+          # Increase this value to reset cache if etc/example-environment.yml has not changed
+          CACHE_NUMBER: 0
+        id: cache
+
+      - name: Update environment
+        run:
+          mamba env update -n rmarkdown-env -f envs/environment.yml
+        if: steps.cache.outputs.cache-hit != 'true'
 
       - name: Render Rmd files
         run: |