feat(ISD-843): Add Postgresql integration (#13)

Author: Amanda H. L. de Andrade Katz

charmcraft.yaml

@@ -12,3 +12,7 @@ bases:
     run-on:
     - name: ubuntu
       channel: "22.04"
+parts:
+  charm:
+    charm-binary-python-packages:
+      - psycopg2-binary==2.9.6