Add TCMALLOC option to build of rocksdb

Makefile

@@ -2,6 +2,7 @@ BIN_IMAGE = blockbook-build
 DEB_IMAGE = blockbook-build-deb
 PACKAGER = $(shell id -u):$(shell id -g)
 NO_CACHE = false
+TCMALLOC = 
 ARGS ?=
 
 TARGETS=$(subst .json,, $(shell ls configs/coins))
@@ -44,7 +45,7 @@ build-images: clean-images
 .bin-image:
 	@if [ $$(build/tools/image_status.sh $(BIN_IMAGE):latest build/docker) != "ok" ]; then \
 		echo "Building image $(BIN_IMAGE)..."; \
-		docker build --no-cache=$(NO_CACHE) -t $(BIN_IMAGE) build/docker/bin; \
+		docker build --no-cache=$(NO_CACHE) --build-arg TCMALLOC=$(TCMALLOC) -t $(BIN_IMAGE) build/docker/bin; \
 	else \
 		echo "Image $(BIN_IMAGE) is up to date"; \
 	fi

build/docker/bin/Dockerfile

@@ -15,9 +15,16 @@ ENV GOPATH=/go
 ENV PATH=$PATH:$GOPATH/bin
 ENV CGO_CFLAGS="-I/opt/rocksdb/include"
 ENV CGO_LDFLAGS="-L/opt/rocksdb -ldl -lrocksdb -lstdc++ -lm -lz -lbz2 -lsnappy -llz4"
+ARG TCMALLOC
 
 RUN mkdir /build
 
+RUN if [ -n "${TCMALLOC}" ]; then \
+    echo "Using TCMALLOC"; \
+    apt-get install -y google-perftools; \
+    ln -s /usr/lib/libtcmalloc.so.4 /usr/lib/libtcmalloc.so;\
+fi
+
 # install and configure go
 RUN cd /opt && wget https://dl.google.com/go/$GOLANG_VERSION.tar.gz && \
     tar xf $GOLANG_VERSION.tar.gz