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Fix Dockerfile format 

Signed-off-by: Kang HuaiShuai <khs1994@khs1994.com>
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khs1994 2019-06-03 22:30:35 +08:00 committed by Kang HuaiShuai
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@ -142,7 +142,7 @@ $ docker buildx build --platform linux/amd64,linux/arm64 .
Finally, depending on your project, the language that you use may have good support for cross-compilation. In that case, multi-stage builds in Dockerfiles can be effectively used to build binaries for the platform specified with `--platform` using the native architecture of the build node. List of build arguments like `BUILDPLATFORM` and `TARGETPLATFORM` are available automatically inside your Dockerfile and can be leveraged by the processes running as part of your build.
```
FROM --platform $BUILDPLATFORM golang:alpine AS build
FROM --platform=$BUILDPLATFORM golang:alpine AS build
ARG TARGETPLATFORM
ARG BUILDPLATFORM
RUN echo "I am running on $BUILDPLATFORM, building for $TARGETPLATFORM" > /log