Add Docker support.

Dockerfile

@@ -0,0 +1,17 @@
+FROM golang:alpine AS build
+
+WORKDIR /go/src/github.com/yukimochi/Activity-Relay
+COPY . /go/src/github.com/yukimochi/Activity-Relay
+
+RUN  mkdir -p /rootfs/usr/bin && \
+     apk add -U --no-cache git && \
+     go get -u github.com/golang/dep/cmd/dep && \
+     dep ensure && \
+     go build -o /rootfs/usr/bin/server . && \
+     go build -o /rootfs/usr/bin/worker ./worker
+
+FROM alpine
+
+COPY --from=build /rootfs/usr/bin /usr/bin
+RUN  chmod +x /usr/bin/server /usr/bin/worker && \
+     apk add -U --no-cache ca-certificates

docker-compose.yml

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+version: "2.3"
+services:
+  redis:
+    restart: always
+    image: redis:alpine
+
+  worker:
+    build: .
+    image: yukimochi/activity-relay
+    restart: always
+    init: true
+    command: worker
+    environment:
+      - "ACTOR_PEM=/actor.pem"
+      - "RELAY_DOMAIN=relay.toot.yukimochi.jp"
+      - "REDIS_URL=redis:6379"
+    volumes:
+      - "./actor.pem:/actor.pem"
+
+  server:
+    build: .
+    image: yukimochi/activity-relay
+    restart: always
+    init: true
+    command: server
+    environment:
+      - "ACTOR_PEM=/actor.pem"
+      - "RELAY_DOMAIN=relay.toot.yukimochi.jp"
+      - "RELAY_BIND=0.0.0.0:8080"
+      - "REDIS_URL=redis:6379"
+    volumes:
+      - "./actor.pem:/actor.pem"