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Mark Dockerfile as requiring BuildKit #12541

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1 change: 1 addition & 0 deletions changelog.d/12541.docker
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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.
1 change: 1 addition & 0 deletions docker/Dockerfile
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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
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