Include opencontainers labels in Docker image (#9612)

Cf. https://github.com/opencontainers/image-spec/blob/master/annotations.md#pre-defined-annotation-keys Signed-off-by: Johannes Wienke <[email protected]>
matrix-org · Mar 22, 2021 · 4612302 · 4612302
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diff --git a/changelog.d/9612.docker b/changelog.d/9612.docker
@@ -0,0 +1 @@
+Include [opencontainers labels](https://github.com/opencontainers/image-spec/blob/master/annotations.md#pre-defined-annotation-keys) in the Docker image.
diff --git a/docker/Dockerfile b/docker/Dockerfile
@@ -18,6 +18,11 @@ ARG PYTHON_VERSION=3.8
 ###
 FROM docker.io/python:${PYTHON_VERSION}-slim as builder
 
+LABEL org.opencontainers.image.url='https://matrix.org/docs/projects/server/synapse'
+LABEL org.opencontainers.image.documentation='https://github.com/matrix-org/synapse/blob/master/docker/README.md'
+LABEL org.opencontainers.image.source='https://github.com/matrix-org/synapse.git'
+LABEL org.opencontainers.image.licenses='Apache-2.0'
+
 # install the OS build deps
 RUN apt-get update && apt-get install -y \
     build-essential \