Mark Dockerfile as requiring BuildKit (#12541)
Co-authored-by: David Robertson <davidr@element.io>
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Explicitly opt-in to using [BuildKit-specific features](https://github.com/moby/buildkit/blob/master/frontend/dockerfile/docs/syntax.md) in the Dockerfile. This fixes issues with building images in some GitLab CI environments.
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# syntax=docker/dockerfile:1
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# Dockerfile to build the matrixdotorg/synapse docker images.
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#
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# Note that it uses features which are only available in BuildKit - see
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