Unblock signals inn raftable

Author: knizhnik

contrib/mmts/Dockerfile

@@ -31,7 +31,7 @@ USER postgres
 ENV CFLAGS -O0
 WORKDIR /pg
 
-ENV REBUILD 6
+ENV REBUILD 7
 
 RUN cd /pg && \
 	git clone https://github.com/postgrespro/postgres_cluster.git --depth 1 && \

contrib/raftable/worker.c

@@ -465,6 +465,8 @@ static void worker_main(Datum arg)
     sigfillset(&sset);
     sigprocmask(SIG_UNBLOCK, &sset, NULL);
 
+	BackgroundWorkerUnblockSignals();
+
 	server.raftsock = raft_create_udp_socket(raft);
 	add_socket(server.raftsock);
 	add_socket(server.listener);