👷 Fix install MkDocs Insiders only when available (#778)

.github/workflows/build-docs.yml

@@ -53,12 +53,12 @@ jobs:
         id: cache
         with:
           path: ${{ env.pythonLocation }}
-          key: ${{ runner.os }}-python-docs-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'requirements-docs.txt') }}-v01
+          key: ${{ runner.os }}-python-docs-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'requirements-docs.txt') }}-v02
       - name: Install docs extras
         if: steps.cache.outputs.cache-hit != 'true'
         run: pip install -r requirements-docs.txt
       - name: Install Material for MkDocs Insiders
-        if: ( github.event_name != 'pull_request' || github.secret_source != 'Actions' ) && steps.cache.outputs.cache-hit != 'true'
+        if: ( github.event_name != 'pull_request' || github.secret_source == 'Actions' ) && steps.cache.outputs.cache-hit != 'true'
         run: |
           pip install git+https://${{ secrets.TYPER_MKDOCS_MATERIAL_INSIDERS }}@github.com/squidfunk/mkdocs-material-insiders.git
           pip install git+https://${{ secrets.TYPER_MKDOCS_MATERIAL_INSIDERS }}@github.com/pawamoy-insiders/griffe-typing-deprecated.git
@@ -71,7 +71,7 @@ jobs:
         if: github.event_name == 'pull_request' && github.secret_source != 'Actions'
         run: python -m mkdocs build
       - name: Build Docs with Insiders
-        if: ( github.event_name != 'pull_request' || github.secret_source != 'Actions' )
+        if: ( github.event_name != 'pull_request' || github.secret_source == 'Actions' )
         run: python -m mkdocs build --config-file mkdocs.insiders.yml
 
       - uses: actions/upload-artifact@v3