add `syntax` parser directive to Dockerfile (#8055)
As recommended by https://docs.docker.com/build/concepts/dockerfile/#dockerfile-syntax
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# syntax=docker/dockerfile:1
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FROM buildpack-deps:focal-scm as godeps
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FROM buildpack-deps:focal-scm as godeps
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ARG GO_VERSION
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ARG GO_VERSION
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# Provided automatically by docker build.
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# Provided automatically by docker build.
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# syntax=docker/dockerfile:1
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ARG GO_VERSION
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ARG GO_VERSION
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FROM golang:${GO_VERSION} AS build
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FROM golang:${GO_VERSION} AS build
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