Mark Dockerfile as requiring BuildKit (#12541)

Co-authored-by: David Robertson <davidr@element.io>
matrix-org · Apr 26, 2022 · 706456d · 706456d
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diff --git a/changelog.d/12541.docker b/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.
diff --git a/docker/Dockerfile b/docker/Dockerfile
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 # Dockerfile to build the matrixdotorg/synapse docker images.
 #
 # Note that it uses features which are only available in BuildKit - see