cleanup action for doc too

Author: rflamary

.github/workflows/build_doc.yml

@@ -15,11 +15,16 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     # Standard drop-in approach that should work for most people.
-
+    - name: Free Disk Space (Ubuntu)
+      uses: insightsengineering/disk-space-reclaimer@v1
+      with:
+        android: true
+        dotnet: true
     - name: Set up Python 3.10
       uses: actions/setup-python@v5
       with:
         python-version: "3.10"
+        cache: 'pip'
 
     - name: Get Python running
       run: |