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Add ARG syntax in dockerfile.md 

Add ARG syntax in dockerfile. https://docs.docker.com/engine/reference/builder/#arg
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Yash Thakkar 2019-10-20 12:08:13 +05:30 committed by GitHub
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dockerfile.md
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@ -22,6 +22,11 @@ ENV APP_HOME /myapp
RUN mkdir $APP_HOME
```
```docker
ARG APP_HOME=""
RUN mkdir $APP_HOME
```
### Initialization
```docker