[#159] Add docker/$(BINS) target

Use this target to build binaries in clean docker environment.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

Makefile

@@ -2,6 +2,7 @@
 
 REPO ?= $(shell go list -m)
 VERSION ?= $(shell git describe --tags --dirty --always)
+GO_VERSION ?= 1.17
 BUILD ?= $(shell date -u --iso=seconds)
 
 HUB_IMAGE ?= nspccdev/neofs-http-gw
@@ -10,9 +11,9 @@ HUB_TAG ?= "$(shell echo ${VERSION} | sed 's/^v//')"
 # List of binaries to build. For now just one.
 BINDIR = bin
 DIRS = $(BINDIR)
-BINS = "$(BINDIR)/neofs-http-gw"
+BINS = $(BINDIR)/neofs-http-gw
 
-.PHONY: help all dep clean fmts fmt imports test cover lint docker/lint
+.PHONY: help all $(BINS) $(DIRS) docker/$(BINS) dep test cover fmts fmt imports image image-push dirty-image lint docker/lint version clean
 
 # Make all binaries
 all: $(BINS)
@@ -29,6 +30,15 @@ $(DIRS):
 	@echo "⇒ Ensure dir: $@"
 	@mkdir -p $@
 
+docker/$(BINS):
+	@echo "=> Building binary using clean Docker environment"
+	@docker run --rm -t \
+	-v `pwd`:/src \
+	-w /src \
+	-u "$$(id -u):$$(id -g)" \
+	--env HOME=/src \
+	golang:$(GO_VERSION) make $(BINS)
+
 # Pull go dependencies
 dep:
 	@printf "⇒ Download requirements: "

README.md

@@ -21,9 +21,10 @@ NeoFS HTTP Gateway bridges NeoFS internal protocol and HTTP standard.
 ```go install github.com/nspcc-dev/neofs-http-gw```
 
 Or you can call `make` to build it from the cloned repository (the binary will
-end up in `bin/neofs-http-gw`).
+end up in `bin/neofs-http-gw`). To build neofs-http-gw binary in clean docker
+environment, call `make docker/bin/neofs-http-gw`.
 
-Notable make targets:
+Other notable make targets:
 
 ```
 dep          Check and ensure dependencies