Merge branch 'test_doc' into ch_struct

Author: jvdp1

.github/workflows/doc-deployment.yml

@@ -24,6 +24,8 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0 # Full history to get tag and commit info
+      - name: Install GFortran macOS
+        run: brew install gcc || brew upgrade gcc || true
       - name: Install Dependencies
         run: |
           pip3 install --prefer-binary --no-clean --disable-pip-version-check --progress-bar off lxml fypp