Uninstall old postgres before installing new one.

.github/workflows/budibase_ci.yml

@@ -203,6 +203,12 @@ jobs:
       - name: Set up PostgreSQL 16
         if: matrix.datasource == 'postgres'
         run: |
+          sudo systemctl stop postgresql
+          sudo apt-get remove --purge -y postgresql* libpq-dev
+          sudo rm -rf /etc/postgresql /var/lib/postgresql
+          sudo apt-get autoremove -y
+          sudo apt-get autoclean
+
           sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
           wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
           sudo apt-get update