action: also purge postgresql packages

Author: EmilienM

action.yaml

@@ -23,9 +23,8 @@ runs:
     - name: Start MySQL
       run: sudo systemctl start mysql.service
       shell: bash
-    # See http://lists.openstack.org/pipermail/openstack-discuss/2020-October/018060.html
-    - name: Remove python3-simplejson
-      run: sudo apt-get purge -y python3-simplejson python-pyasn1-modules || true
+    - name: Remove unwanted packages
+      run: sudo apt-get purge -y python3-simplejson python-pyasn1-modules postgresql* || true
       shell: bash
     - name: Checkout Devstack
       uses: actions/checkout@v2