使用方式：

$ gf docker -h
USAGE
    gf docker [FILE] [OPTION]

ARGUMENT
    FILE      file path for "gf build", it's "main.go" in default.
    OPTION    the same options as "docker build" except some options as follows defined

OPTION
    -p, --push  auto push the docker image to docker registry if "-t" option passed

EXAMPLES
    gf docker
    gf docker -t hub.docker.com/john/image:tag
    gf docker -p -t hub.docker.com/john/image:tag
    gf docker main.go
    gf docker main.go -t hub.docker.com/john/image:tag
    gf docker main.go -t hub.docker.com/john/image:tag
    gf docker main.go -p -t hub.docker.com/john/image:tag

DESCRIPTION
    The "docker" command builds the GF project to a docker images.
    It runs "gf build" firstly to compile the project to binary file.
    It then runs "docker build" command automatically to generate the docker image.
    You should have docker installed, and there must be a Dockerfile in the root of the project.

自动编译并生成docker镜像。非必需FILE参数为编译文件路径，默认为main.go。非必需参数OPTIONS为docker build命令相同参数及选项。

使用示例：

$ gf docker main.go -p -t loads/gf-demos:test          
2020-12-31 00:47:28.207 start building...
2020-12-31 00:47:28.207 go build -o ./bin/linux_amd64/main main.go
2020-12-31 00:47:35.894 done!
Sending build context to Docker daemon  37.63MB
Step 1/10 : FROM loads/alpine:3.8
 ---> f9fb622e6db2
Step 2/10 : LABEL maintainer="john@goframe.org"
 ---> Using cache
 ---> da238418d031
Step 3/10 : ENV WORKDIR /var/www/gf-demos
 ---> Using cache
 ---> 3e7129c087c9
Step 4/10 : ADD ./bin/linux_amd64/main   $WORKDIR/main
 ---> 3661a9dea494
Step 5/10 : RUN chmod +x $WORKDIR/main
 ---> Running in 1d49d5d91080
Removing intermediate container 1d49d5d91080
 ---> a03ee04e3380
Step 6/10 : ADD public   $WORKDIR/public
 ---> 63dd06d0e1a3
Step 7/10 : ADD config   $WORKDIR/config
 ---> fa7a57eba577
Step 8/10 : ADD template $WORKDIR/template
 ---> 7075609b0447
Step 9/10 : WORKDIR $WORKDIR
 ---> Running in a34ef38e1031
Removing intermediate container a34ef38e1031
 ---> 580077998eaf
Step 10/10 : CMD ./main
 ---> Running in ed286b518ad9
Removing intermediate container ed286b518ad9
 ---> fbbc05842901
Successfully built fbbc05842901
Successfully tagged loads/gf-demos:test
The push refers to repository [docker.io/loads/gf-demos]
b4025b95a79f: Preparing 
9e0369a57507: Preparing 
46c68dcc8e12: Preparing 
59adbc083ee5: Preparing 
10e0b999ba57: Preparing 
8e850d7b086e: Waiting 
d5e057db20a2: Waiting 
92e898fd7f84: Waiting 
d9ff549177a9: Waiting 
...



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