try just postgres

.github/workflows/main.yaml

@@ -39,9 +39,8 @@ jobs:
       - name: Install Postgresql 15 for unit tests
         id: install-postgres-15
         run: |
-            echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg main" | sudo tee  /etc/apt/sources.list.d/pgdg.list && \
             sudo apt-get update -qy && \
-            sudo apt install -qy postgresql-15
+            sudo apt install -qy postgresql
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4