Mark Dockerfile as requiring BuildKit (#12541)

Co-authored-by: David Robertson <davidr@element.io>
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Jason Robinson 2022-04-26 17:31:52 +03:00 committed by GitHub
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changelog.d/12541.docker Normal file
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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
# Dockerfile to build the matrixdotorg/synapse docker images.
#
# Note that it uses features which are only available in BuildKit - see