Add dist target (#21)

* Add dist target

Dockerfile

@@ -7,10 +7,10 @@ FROM alpine:3.7
 ENV INSTALL_PATH=/packages/bin
 ENV PATH=${INSTALL_PATH}:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 RUN mkdir -p ${INSTALL_PATH}
-RUN apk add --update --no-cache make curl coreutils libc6-compat
+RUN apk add --update --no-cache bash make curl coreutils libc6-compat
 
 COPY --from=cfssl /go/bin/ ${INSTALL_PATH}/
 
 ADD . /packages
 RUN make -C /packages/install/ all
-WORKDIR /opt
+WORKDIR /packages

Makefile

@@ -7,13 +7,22 @@ export DOCKER_BUILD_FLAGS =
 export DEFAULT_HELP_TARGET := help/install
 export README_DEPS ?= docs/targets.md
 
+export DIST_CMD ?= cp -a
+export DIST_PATH ?= /dist
+export INSTALL_PATH ?= /packages/bin
+
 -include $(shell curl -sSL -o .build-harness "https://git.io/build-harness"; echo .build-harness)
 
 all: init deps build install run
 
 deps:
 	@exit 0
 
+## Create a distribution by coping $PACKAGES from $INSTALL_PATH to $DIST_PATH
+dist:
+	mkdir -p $(DIST_PATH)
+	cd $(INSTALL_PATH) && $(DIST_CMD) $(PACKAGES) $(DIST_PATH)
+
 build:
 	@make --no-print-directory docker:build