adding docker image build

Signed-off-by: Martin Buchleitner <mbuchleitner@infralovers.com>

.dockerignore

@@ -0,0 +1,2 @@
+Dockerfile
+.travis.yml

Dockerfile

@@ -0,0 +1,25 @@
+FROM golang:stretch as builder
+
+RUN mkdir -p $GOPATH/pkg/mod $GOPATH/bin
+
+RUN apt-get update \
+  && apt-get install -y ruby ruby-dev curl  \
+  && gem install --no-document fpm \
+  && curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh \
+  && mkdir -p $GOPATH/src/github.com/davidnewhall
+
+COPY . $GOPATH/src/github.com/davidnewhall/unifi-poller
+WORKDIR $GOPATH/src/github.com/davidnewhall/unifi-poller
+
+RUN dep ensure \
+  && make dockerbin
+
+FROM scratch 
+
+COPY --from=builder /go/src/github.com/davidnewhall/unifi-poller/unifi-poller.dockerbin /unifi-poller
+COPY --from=builder /go/src/github.com/davidnewhall/unifi-poller/examples/up.conf.example /etc/unifi-poller/up.conf
+
+VOLUME [ "/etc/unifi-poller"]
+
+ENTRYPOINT [ "/unifi-poller" ]
+CMD [ "--config=/etc/unifi-poller/up.conf" ]

Makefile

@@ -9,6 +9,7 @@ OSX_PKG_PREFIX=com.github.davidnewhall
 GOLANGCI_LINT_ARGS=--enable-all -D gochecknoglobals
 PACKAGE:=./cmd/$(BINARY)
 LIBRARY:=./pkg/$(BINARY)
+DOCKER_REPO=""
 
 ITERATION:=$(shell git rev-list --count HEAD||echo 0)
 ifeq ($(VERSION),)
@@ -69,6 +70,12 @@ $(BINARY).linux:
 	# Building linux binary.
 	GOOS=linux go build -o $(BINARY).linux -ldflags "-w -s -X github.com/davidnewhall/unifi-poller/pkg/unifi-poller.Version=$(VERSION)" $(PACKAGE)
 
+dockerbin: $(BINARY).dockerbin
+$(BINARY).dockerbin:
+	# Building linux binary.
+	CGO_ENABLED=0 GOOS=linux go build -o $(BINARY).dockerbin -ldflags "-w -s -X github.com/davidnewhall/unifi-poller/pkg/unifi-poller.Version=$(VERSION)" $(PACKAGE)
+
+
 macos: $(BINARY).macos
 $(BINARY).macos:
 	# Building darwin binary.
@@ -122,6 +129,9 @@ $(BINARY)-$(VERSION).pkg: check_fpm package_build_osx
 		--description "$(DESC)" \
 		--chdir package_build_osx
 
+docker:
+	docker build -t ${DOCKER_REPO}/${BINARY} .
+
 # OSX packages use /usr/local because Apple doesn't allow writing many other places.
 package_build_osx: readme man macos
 	# Building package environment for macOS.