Add missing venv setup step to docs jobs

Both in the CI pipeline and the release job.

.github/workflows/lint-and-test.yaml

@@ -26,6 +26,7 @@ jobs:
           cache: pip
           cache-dependency-path: |
             requirements-dev.txt
+            requirements-docs.txt
             pyproject.toml
       - name: Install dependencies
         run: |
@@ -63,6 +64,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
+    - name: Set up Python and dependencies
+      uses: actions/setup-python@v4
+      with:
+        python-version: 3.11
+        cache: pip
+        cache-dependency-path: |
+          requirements-dev.txt
+          requirements-docs.txt
+          pyproject.toml
+    - name: Install dependencies
+      run: |
+        pip install -r requirements-dev.txt -r requirements-docs.txt
+        pip install -e . --no-deps
     - uses: ./.github/actions/mike-docs
       with:
         version: latest

.github/workflows/release.yaml

@@ -22,7 +22,12 @@ jobs:
           cache: pip
           cache-dependency-path: |
             requirements-dev.txt
+            requirements-docs.txt
             pyproject.toml
+      - name: Install dependencies
+        run: |
+          pip install -r requirements-dev.txt -r requirements-docs.txt
+          pip install -e . --no-deps
       - name: Build and check
         run: |
           python -m build