Add possibility to build from BASE_IMAGE

Makefile

@@ -1,6 +1,7 @@
 BIN_IMAGE = blockbook-build
 DEB_IMAGE = blockbook-build-deb
 PACKAGER = $(shell id -u):$(shell id -g)
+BASE_IMAGE = $$(awk -F= '$$1=="ID" { print $$2 ;}' /etc/os-release):$$(awk -F= '$$1=="VERSION_ID" { print $$2 ;}' /etc/os-release | tr -d '"')
 NO_CACHE = false
 TCMALLOC = 
 ARGS ?=
@@ -44,8 +45,8 @@ 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) --build-arg TCMALLOC=$(TCMALLOC) -t $(BIN_IMAGE) build/docker/bin; \
+		echo "Building image $(BIN_IMAGE) from $(BASE_IMAGE)"; \
+		docker build --no-cache=$(NO_CACHE) --build-arg TCMALLOC=$(TCMALLOC) --build-arg BASE_IMAGE=$(BASE_IMAGE) -t $(BIN_IMAGE) build/docker/bin; \
 	else \
 		echo "Image $(BIN_IMAGE) is up to date"; \
 	fi

build/docker/bin/Dockerfile

@@ -1,6 +1,6 @@
-# initialize from the image
-
-FROM debian:9
+# initialize from the image defined by BASE_IMAGE
+ARG BASE_IMAGE
+FROM $BASE_IMAGE
 
 RUN apt-get update && \
     apt-get upgrade -y && \