Add postgres-decoderbufs stream

postgresql.yaml

@@ -55,7 +55,7 @@ data:
             #     ref: stream-postgresql-12
             #     buildorder: 2
             # # https://src.fedoraproject.org/rpms/postgres-decoderbufs/pull-request/1
-            # postgres-decoderbufs:
-            #     rationale: postgres-decoderbufs postgresql extension
-            #     ref: stream-postgresql-12
-            #     buildorder: 2
+            postgres-decoderbufs:
+                rationale: postgres-decoderbufs postgresql extension
+                ref: stream-postgresql-12
+                buildorder: 2