adding dblink to build-tools image for use in regression tests

Makefile

@@ -166,6 +166,8 @@ postgres-%: postgres-configure-% \
 	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/$*/contrib/amcheck install
 	+@echo "Compiling test_decoding $*"
 	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/$*/contrib/test_decoding install
+	+@echo "Compiling dblink $*"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/$*/contrib/dblink install
 
 .PHONY: postgres-clean-%
 postgres-clean-%:

build-tools.Dockerfile

@@ -144,6 +144,7 @@ RUN set -e \
         openssh-client \
         parallel \
         pkg-config \
+        postgresql-contrib \
         unzip \
         wget \
         xz-utils \