Add environment variable to allow connection (#319)

If this is not set, it shuts down DB containers. Causes users to not be able to Deploy or to Debug the containers.

Relevant PR:
docker-library/postgres#658

Author: vvvjo

python/django/python-guestbook/kubernetes-manifests/guestbook-postgres.deployment.yaml

@@ -28,3 +28,6 @@ spec:
           name: db
           ports:
             - containerPort: 5432
+          env:
+            - name: POSTGRES_HOST_AUTH_METHOD
+              value: "trust"