add `syntax` parser directive to Dockerfile (#8055)
As recommended by https://docs.docker.com/build/concepts/dockerfile/#dockerfile-syntax
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				|  | @ -1,3 +1,4 @@ | ||||||
|  | # syntax=docker/dockerfile:1 | ||||||
| FROM buildpack-deps:focal-scm as godeps | FROM buildpack-deps:focal-scm as godeps | ||||||
| ARG GO_VERSION | ARG GO_VERSION | ||||||
| # Provided automatically by docker build. | # Provided automatically by docker build. | ||||||
|  |  | ||||||
|  | @ -1,3 +1,4 @@ | ||||||
|  | # syntax=docker/dockerfile:1 | ||||||
| ARG GO_VERSION | ARG GO_VERSION | ||||||
| 
 | 
 | ||||||
| FROM golang:${GO_VERSION} AS build | FROM golang:${GO_VERSION} AS build | ||||||
|  |  | ||||||
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