CI: Install setuptools in deploy-docs.yml

`setuptools` are not pre-installed in virtual environments created by
Python 3.12.

.github/workflows/deploy-docs.yml

@@ -1,17 +1,23 @@
 name: Deploy documentation
 
+# FIXME
 on:
-  workflow_run:
-    workflows: ["Build and test"]
+  push:
     branches:
-      - master
       - ci
-    types: [completed]
+
+#on:
+#  workflow_run:
+#    workflows: ["Build and test"]
+#    branches:
+#      - master
+#      - ci
+#    types: [completed]
 
 jobs:
   build-and-deploy:
     runs-on: ubuntu-20.04
-    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    #if: ${{ github.event.workflow_run.conclusion == 'success' }}
     steps:
     - uses: actions/checkout@v3
 
@@ -34,12 +40,14 @@ jobs:
     - name: Install Python dependencies
       run: |
            python -m pip install --upgrade pip
+           pip install setuptools
            pip install pybind11 numpy tox sphinx sphinx-rtd-theme myst-parser
 
     - name: Build documentation
       run: |
            export LIBCOMMUTE_DIR=${GITHUB_WORKSPACE}/libcommute.installed
            export LIBCOMMUTE_INCLUDEDIR=${LIBCOMMUTE_DIR}/include
+           pip install .
            sphinx-build -M html docs/ build/sphinx/html
 
     - name: Deploy documentation