Add Docker Hub packaging tasks

Makefile

@@ -1,5 +1,7 @@
 DOKKU_HOST := dokku@dev.lookingfora.name
 SHELL := /bin/bash
+DOCKER_IMAGE_NAME ?= bornholm/hydra-passwordless
+DOCKER_IMAGE_TAG ?= latest
 
 build: vendor
 	CGO_ENABLED=0 go build -mod=vendor -v -o bin/server ./cmd/server
@@ -69,6 +71,27 @@ dokku-deploy-sso:
 	$(if $(shell git config remote.dokku-sso.url),, git remote add dokku-sso $(DOKKU_HOST):sso)
 	git push -f dokku-sso $(shell git rev-parse HEAD):refs/heads/master
 
+docker-build:
+	docker build \
+		--build-arg="HTTP_PROXY=$(HTTP_PROXY)" \
+		--build-arg="HTTPS_PROXY=${HTTP_PROXY}" \
+		--build-arg="https_proxy=${https_proxy}" \
+		--build-arg="http_proxy=${http_proxy}" \
+		-t hydra-passwordless:latest \
+		-f ./misc/docker/Dockerfile \
+		.
+
+docker-run:
+	docker run \
+		-it --rm \
+		-p 3000:3000 \
+		hydra-passwordless:latest
+
+docker-release: docker-build
+	docker image tag hydra-passwordless:latest $(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)
+	docker login
+	docker push $(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)
+
 clean:
 	rm -rf release
 	rm -rf data

misc/docker/Dockerfile

@@ -0,0 +1,24 @@
+FROM golang:1.14 AS build
+
+ARG HTTP_PROXY=
+ARG HTTPS_PROXY=
+ARG http_proxy=
+ARG https_proxy=
+
+RUN apt-get update && apt-get install -y build-essential git bash
+
+COPY . /src
+
+WORKDIR /src
+
+RUN make ARCH_TARGETS=amd64 release
+
+FROM busybox
+
+COPY --from=build /src/release/server-linux-amd64 /app
+
+WORKDIR /app
+
+EXPOSE 3000
+
+CMD ["bin/server", "-workdir", "/app", "-config", "server.yml"]