Add debian make target for local testing

Dockerfile.debian

@@ -0,0 +1,14 @@
+FROM golang:1.9.3
+COPY . /go/src/github.com/keel-hq/keel
+WORKDIR /go/src/github.com/keel-hq/keel
+RUN make build
+
+FROM debian:latest
+RUN apt-get update && apt-get install -y \
+  ca-certificates \
+  && rm -rf /var/lib/apt/lists/*
+
+COPY --from=0 /go/src/github.com/keel-hq/keel/cmd/keel/keel /bin/keel
+ENTRYPOINT ["/bin/keel"]
+
+EXPOSE 9300

Makefile

@@ -22,6 +22,9 @@ install:
 image:
 	docker build -t keelhq/keel:alpha -f Dockerfile .
 
+image-debian:
+	docker build -t keelhq/keel:alpha -f Dockerfile.debian .
+
 alpha: image
 	@echo "++ Pushing keel alpha"	
 	docker push keelhq/keel:alpha