diff --git a/.github/workflows/sphinx.yml b/.github/workflows/sphinx.yml
new file mode 100644
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+++ b/.github/workflows/sphinx.yml
@@ -0,0 +1,107 @@
+# From: https://github.com/rkdarst/sphinx-actions-test/blob/master/.github/workflows/sphinx-build.yml
+
+name: sphinx
+on: [push, pull_request]
+
+env:
+  DEFAULT_BRANCH: "master"
+  #SPHINXOPTS: "-W --keep-going -T"
+  # ^-- If these SPHINXOPTS are enabled, then be strict about the builds and fail on any warnings
+
+jobs:
+  build-and-deploy:
+    name: Build and gh-pages
+    runs-on: ubuntu-latest
+    steps:
+      # https://github.com/marketplace/actions/checkout
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          lfs: true
+      # https://github.com/marketplace/actions/setup-python
+      # ^-- This gives info on matrix testing.
+      - name: Install Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+      # https://docs.github.com/en/actions/guides/building-and-testing-python#caching-dependencies
+      # ^-- How to set up caching for pip on Ubuntu
+      - name: Cache pip
+        uses: actions/cache@v2
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+            ${{ runner.os }}-
+      - name: Cache poetry
+        uses: actions/cache@v2
+        with:
+          #path: ~/.cache/pip
+          path: ~/.cache/pypoetry/virtualenvs
+          key: ${{ runner.os }}-pip-${{ hashFiles('pyproject.toml') }}
+          #key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+            ${{ runner.os }}-
+      # https://docs.github.com/en/actions/guides/building-and-testing-python#installing-dependencies
+      # ^-- This gives info on installing dependencies with pip
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install poetry
+          poetry config virtualenvs.create false
+          poetry install
+
+      - name: Debugging information
+        run: |
+          echo "github.ref:" ${{github.ref}}
+          echo "github.event_name:" ${{github.event_name}}
+          echo "github.head_ref:" ${{github.head_ref}}
+          echo "github.base_ref:" ${{github.base_ref}}
+          set -x
+          git rev-parse --abbrev-ref HEAD
+          git branch
+          git branch -a
+          git remote -v
+          python -V
+          pip list --not-required
+          pip list
+          poetry debug
+
+      # Build
+      #- uses: ammaraskar/sphinx-problem-matcher@master
+      - name: Build Sphinx docs
+        working-directory: ./docs
+        run: |
+          ./build_doc.sh
+          # make dirhtml
+          # This fixes broken copy button icons, as explained in
+          #   https://github.com/coderefinery/sphinx-lesson/issues/50
+          #   https://github.com/executablebooks/sphinx-copybutton/issues/110
+          # This can be removed once these PRs are accepted (but the
+          # fixes also need to propagate to other themes):
+          #   https://github.com/sphinx-doc/sphinx/pull/8524
+          #   https://github.com/readthedocs/sphinx_rtd_theme/pull/1025
+          #sed -i 's/url_root="#"/url_root=""/' _build/html/index.html || true
+
+
+      # Add the .nojekyll file
+      - name: nojekyll
+        working-directory: ./docs
+        #if: ${{ github.event_name == 'push' }}
+        run: |
+          touch _build/.nojekyll
+
+      # Deploy
+      # https://github.com/peaceiris/actions-gh-pages
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        #if: ${{ github.event_name == 'push' }}
+        #if: ${{ success() && github.event_name == 'push' && github.ref == 'refs/heads/$defaultBranch' }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./docs/_build/
+          publish_branch: gh-pages
+          force_orphan: true
+