Fix up Dockerfile.

Dockerfile

@@ -6,7 +6,6 @@ COPY . /Activity-Relay
 RUN  mkdir -p /rootfs/usr/bin && \
      apk add -U --no-cache git && \
      go build -o /rootfs/usr/bin/relay -ldflags "-X main.version=$(git describe --tags HEAD)" . && \
-     go build -o /rootfs/usr/bin/worker -ldflags "-X main.version=$(git describe --tags HEAD)"  ./worker && \
      go build -o /rootfs/usr/bin/ar-cli -ldflags "-X main.version=$(git describe --tags HEAD)"  ./cli
 
 FROM alpine

docker-compose.yml

@@ -13,7 +13,7 @@ services:
     image: yukimochi/activity-relay
     restart: always
     init: true
-    command: worker
+    command: relay worker
     environment:
       - "ACTOR_PEM=/actor.pem"
       - "RELAY_DOMAIN=relay.toot.yukimochi.jp"