forgejo: configure crunchydata postgres cluster to prune backups

Signed-off-by: David Kirwan <davidkirwanirl@gmail.com>

roles/openshift-apps/forgejo/templates/postgres-cluster.yaml.j2

@@ -34,8 +34,17 @@ spec:
                   postgres-operator.crunchydata.com/instance-set: forgejo-ha
   backups:
     pgbackrest:
+      global:
+        repo1-retention-full: "1"
+        repo1-retention-full-type: time
+      manual:
+        options:
+        - --type=full
+        repoName: repo1
       repos:
       - name: repo1
+        schedules:
+          full: 0 1 * * 0
         volume:
           volumeClaimSpec:
             accessModes: