Update Dockerfile and Makefile to remove --no-cache option and copy helper binaries

Author: m3hm3t

circleci/images/Makefile

@@ -47,7 +47,7 @@ push-all:: push-extbuilder-$1
 push-extbuilder-all:: push-extbuilder-$1
 
 build-exttester-$1:
-	docker build  --no-cache \
+	docker build \
 		exttester/ \
 		-f exttester/Dockerfile \
 		--build-arg=PG_VERSION=$1 \

circleci/images/exttester/Dockerfile

@@ -178,6 +178,9 @@ apt-get install -y --no-install-recommends --allow-downgrades \
 rm -rf /var/lib/apt/lists/*
 EOF
 
+# ---------- copy helper binaries ----------
+COPY --from=dev-tools-collection /collect/ /
+
 # now do the symlink (outside the heredoc!) in its own layer
 RUN ln -s /usr/lib/x86_64-linux-gnu/libpq.so.5 \
            /usr/lib/postgresql/${PG_MAJOR}/lib/libpq.so.5 && \