Optimize docker image

Dockerfile

@@ -1,14 +1,31 @@
-FROM golang:1.12-stretch as builder
+FROM golang:1.12-alpine as builder
+RUN apk update && \
+    apk add --no-cache git && \
+    apk add --no-cache upx=3.95-r1
+
 COPY . /app
 WORKDIR /app
+
 ENV GO111MODULE=on
-RUN CGO_ENABLED=0 GOOS=linux go build -o service
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o service && \
+    upx --ultra-brute -qq service && \
+    upx -t service
+    
 RUN go get github.com/pilu/fresh
 
 #second stage
 FROM alpine:latest
 WORKDIR /app
 RUN apk add --no-cache tzdata
+
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
-COPY --from=builder /app .
+COPY --from=builder /app/service .
+COPY web/build /app/web/build/
+COPY dev.yml .
+
+RUN chmod +x /app/service
+USER nobody
+
+EXPOSE 8080
+
 CMD ./service