forgejo: add the template for creating the PostgresCluster

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

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

@@ -0,0 +1,51 @@
+apiVersion: postgres-operator.crunchydata.com/v1beta1
+kind: PostgresCluster
+metadata:
+  name: forgejo-ha
+  namespace: forgejo
+spec:
+  postgresVersion: 17
+  instances:
+    - name: forgejo-ha
+      replicas: 2
+      dataVolumeClaimSpec:
+        accessModes:
+        - "ReadWriteOnce"
+        resources:
+          requests:
+            storage: 50Gi
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 1
+            podAffinityTerm:
+              topologyKey: kubernetes.io/hostname
+              labelSelector:
+                matchLabels:
+                  postgres-operator.crunchydata.com/cluster: forgejo-ha
+                  postgres-operator.crunchydata.com/instance-set: forgejo-ha
+  backups:
+    pgbackrest:
+      repos:
+      - name: repo1
+        volume:
+          volumeClaimSpec:
+            accessModes:
+            - "ReadWriteOnce"
+            resources:
+              requests:
+                storage: 50Gi
+  proxy:
+    pgBouncer:
+      replicas: 2
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 1
+            podAffinityTerm:
+              topologyKey: kubernetes.io/hostname
+              labelSelector:
+                matchLabels:
+                  postgres-operator.crunchydata.com/cluster: forgejo-ha
+                  postgres-operator.crunchydata.com/role: pgbouncer
+