install missing system dependencies

.github/workflows/unit_tests.yml

@@ -21,6 +21,11 @@ jobs:
         with:
           python-version: '3.11'
 
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc libldap2-dev libsasl2-dev libssl-dev
+
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip