Dockerfile: use syntax=docker/dockerfile:1
Now that HEREDOC is included in the stable Dockerfile syntax, we can use the latest stable syntax for all Dockerfiles. The recommendation for the stable syntax is to use `:1` (which is equivalent to "latest" stable syntax. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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@ -1,4 +1,4 @@
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# syntax=docker/dockerfile:1.3
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# syntax=docker/dockerfile:1
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FROM koalaman/shellcheck-alpine:v0.7.1 AS shellcheck
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WORKDIR /go/src/github.com/docker/cli
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