fix: readme

Makefile

@@ -6,28 +6,34 @@ UID?=$(shell id -u)
 GID?=$(shell id -g)
 
 # VERSION
+# UID/GID
+# UID or GID is the UNIX user ID or group ID of the user who executes
+# make. If the UID or GID is not passed as a make variable, an attempt
+# is made to determine it.
+UID?=$(shell id -u)
+GID?=$(shell id -g)
+
 # If no version is specified as a parameter of make, the last git hash
 # value is taken.
-VERSION ?= "$(shell git rev-parse --short HEAD)-git"
+VERSION:=$(or ${TRAVIS_TAG}, ${TRAVIS_TAG}, $(shell git rev-parse --short HEAD)-git)
 
-# PHONY
-# A phony target is one that is not really the name of a file; rather it
-# is just a name for a recipe to be executed when you make an explicit
-# request.
-.PHONY: flucky flucky-amd64 flucky-arm
+GOARCH?=amd64
+GOOS?=linux
 
 # default build
-flucky: flucky-amd64
+build:
+	GOOS=${GOOS} \
+	GOARCH=${GOARCH} \
+		go build -ldflags "-X main.version=${VERSION}"
 
-# build flucky for amd64 architecture
-flucky-amd64:
-	GOOS=linux \
-	GOARCH=amd64 \
-		go build -o flucky-amd64 -ldflags "-X main.version=${VERSION}"
+docker-build:
+	docker run \
+		--volume ${PWD}:/workspace \
+		volkerraschek/build-image:1.0.0 \
+			make build VERSION=${VERSION} GOOS=${GOOS} GOARCH=${GOARCH}
 
-# build flucky for arm architecture
-flucky-arm:
-	GOOS=linux \
-	GOARCH=arm \
-	GOARM=7 \
-		go build -o fctl-arm -ldflags "-X main.version=${VERSION}"
+docker-sanitized:
+	docker run \
+		--volume ${PWD}:/workspace \
+		volkerraschek/build-image:1.0.0 \
+			chown ${UID}:${GID} -R /workspace