add docker support

Dockerfile

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+# 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"]

build-docker.sh

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+#!/usr/bin/env bash
+
+mode=$1;
+version=`grep "const LAB_VERSION" lab.go | awk -F '=' '{print $2}' | tr -d ' ' | tr -d '"'`;
+
+if [ "$mode" == "--snapshot" ]; then
+  version="SNAPSHOT-"`date "+%Y%m%d"`;
+fi
+
+echo "Building docker image...";
+docker build -t lab:${version} .

docker/docker-entrypoint.sh

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+#!/bin/sh
+
+set -e;
+export LAB_USER=labapp;
+export LAB_GROUP=labapp;
+
+prepare_directories() {
+  local log_path="/var/log/labapp";
+
+  if [ "${LAB_LOG_PATH}" != "" ]; then
+    log_path="${LAB_LOG_PATH}";
+  fi
+
+  if [ ! -d "${log_path}" ]; then
+    mkdir ${log_path};
+    chown ${LAB_USER}:${LAB_GROUP} -R ${log_path};
+  fi
+}
+
+prepare_directories;
+
+conf_path_param="";
+
+if [ "${LAB_CONF_PATH}" != "" ]; then
+  conf_path_param="--conf-path=${LAB_CONF_PATH}";
+fi
+
+exec su-exec ${LAB_USER} /usr/local/bin/labapp/lab server run ${conf_path_param};