add docker support

Dockerfile

@@ -0,0 +1,20 @@
+# Build binary release
+FROM golang:1.14.10-alpine3.12 AS builder
+RUN apk add gcc g++ libc-dev
+WORKDIR /go/src/github.com/mayswind/lab
+COPY . .
+RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=1 go build -a -v -i -trimpath -o lab lab.go
+
+# Package docker image
+FROM alpine:3.12.0
+RUN addgroup -S -g 1000 labapp && adduser -S -G labapp -u 1000 labapp
+RUN apk --no-cache add su-exec tzdata
+COPY --from=builder /go/src/github.com/mayswind/lab/lab /usr/local/bin/labapp/lab
+RUN chmod +x /usr/local/bin/labapp/lab
+COPY conf /usr/local/bin/labapp/conf
+COPY public /usr/local/bin/labapp/public
+WORKDIR /usr/local/bin/labapp
+COPY docker/docker-entrypoint.sh /docker-entrypoint.sh
+RUN chmod +x /docker-entrypoint.sh
+EXPOSE 8080
+ENTRYPOINT ["/docker-entrypoint.sh"]