Add support to install helm

install the binary that was compiled by make build

Signed-off-by: Ma Xinjian <maxj.fnst@cn.fujitsu.com>

Makefile

@@ -1,4 +1,5 @@
 BINDIR      := $(CURDIR)/bin
+INSTALL_PATH ?= /usr/local/bin
 DIST_DIRS   := find * -type d -exec
 TARGETS     := darwin/amd64 linux/amd64 linux/386 linux/arm linux/arm64 linux/ppc64le linux/s390x windows/amd64
 TARGET_OBJS ?= darwin-amd64.tar.gz darwin-amd64.tar.gz.sha256 darwin-amd64.tar.gz.sha256sum linux-amd64.tar.gz linux-amd64.tar.gz.sha256 linux-amd64.tar.gz.sha256sum linux-386.tar.gz linux-386.tar.gz.sha256 linux-386.tar.gz.sha256sum linux-arm.tar.gz linux-arm.tar.gz.sha256 linux-arm.tar.gz.sha256sum linux-arm64.tar.gz linux-arm64.tar.gz.sha256 linux-arm64.tar.gz.sha256sum linux-ppc64le.tar.gz linux-ppc64le.tar.gz.sha256 linux-ppc64le.tar.gz.sha256sum linux-s390x.tar.gz linux-s390x.tar.gz.sha256 linux-s390x.tar.gz.sha256sum windows-amd64.zip windows-amd64.zip.sha256 windows-amd64.zip.sha256sum
@@ -62,6 +63,13 @@ build: $(BINDIR)/$(BINNAME)
 $(BINDIR)/$(BINNAME): $(SRC)
 	GO111MODULE=on go build $(GOFLAGS) -tags '$(TAGS)' -ldflags '$(LDFLAGS)' -o '$(BINDIR)'/$(BINNAME) ./cmd/helm
 
+# ------------------------------------------------------------------------------
+#  install
+
+.PHONY: install
+install: build
+	@install "$(BINDIR)/$(BINNAME)" "$(INSTALL_PATH)/$(BINNAME)"
+
 # ------------------------------------------------------------------------------
 #  test