Deploy stable-docs.datasette.io on publish

Refs https://github.com/simonw/datasette.io/issues/67

.github/workflows/publish.yml

@@ -29,6 +29,7 @@ jobs:
     - name: Run tests
       run: |
         pytest
+
   deploy:
     runs-on: ubuntu-latest
     needs: [test]
@@ -55,6 +56,47 @@ jobs:
       run: |
         python setup.py sdist bdist_wheel
         twine upload dist/*
+
+  deploy_static_docs:
+    runs-on: ubuntu-latest
+    needs: [deploy]
+    # if: "!github.event.release.prerelease"
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.9'
+    - uses: actions/cache@v2
+      name: Configure pip caching
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-publish-pip-${{ hashFiles('**/setup.py') }}
+        restore-keys: |
+          ${{ runner.os }}-publish-pip-
+    - name: Install dependencies
+      run: |
+        python -m pip install -e .[docs]
+        python -m pip install sphinx-to-sqlite==0.1a1
+    - name: Build docs.db
+      run: |-
+        cd docs
+        sphinx-build -b xml . _build
+        sphinx-to-sqlite ../docs.db _build
+        cd ..
+    - name: Set up Cloud Run
+      uses: google-github-actions/setup-gcloud@master
+      with:
+        version: '275.0.0'
+        service_account_email: ${{ secrets.GCP_SA_EMAIL }}
+        service_account_key: ${{ secrets.GCP_SA_KEY }}
+    - name: Deploy stable-docs.datasette.io to Cloud Run
+      run: |-
+        gcloud config set run/region us-central1
+        gcloud config set project datasette-222320
+        datasette publish cloudrun docs.db \
+            --service=datasette-docs-stable
+
   deploy_docker:
     runs-on: ubuntu-latest
     needs: [deploy]