ci(docs): update site URL before docs builds

Move the __SITE_URL__ substitution into dedicated pre-build steps for
GitHub Pages and Read the Docs so zensical can run with the standard
config file.

Author: liblaf

template/.github/workflows/python-docs.yaml

@@ -34,11 +34,10 @@ jobs:
           activate-environment: true
       - name: Install dependencies
         run: uv sync --active --frozen --all-packages
+      - name: Set site url
+        run: sed --in-place 's|__SITE_URL__|${{ steps.config.outputs.base_url }}|g' 'zensical.toml'
       - name: Build
-        run: |-
-          config_file="$(mktemp --suffix='.toml')"
-          sed 's|__SITE_URL__|${{ steps.config.outputs.base_url }}|g' 'zensical.toml' > "$config_file"
-          zensical build --config-file "$config_file"
+        run: zensical build
       - name: Upload Github Pages artifact
         uses: actions/upload-pages-artifact@7b1f4a764d45c48632c6b24a0339c27f5614fb0b # v4
         with:

template/.readthedocs.yaml

@@ -29,12 +29,12 @@ build:
     install:
       - UV_PROJECT_ENVIRONMENT="${READTHEDOCS_VIRTUALENV_PATH}" uv sync --frozen --all-packages --link-mode copy
 
+    pre_build:
+      - sed --in-place "s|__SITE_URL__|$READTHEDOCS_CANONICAL_URL|g" 'zensical.toml'
+
     build:
       html:
-        - |-
-          config_file="$(mktemp --suffix='.toml')"
-          sed "s|__SITE_URL__|$READTHEDOCS_CANONICAL_URL|g" 'zensical.toml' > "$config_file"
-          zensical build --config-file "$config_file"
+        - zensical build
 
     post_build:
       - mkdir --parents --verbose "$READTHEDOCS_OUTPUT/html/"