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diff --git a/docker/complement/Dockerfile b/docker/complement/Dockerfile
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+# A dockerfile which builds an image suitable for testing Synapse under
+# complement.
+
+ARG SYNAPSE_VERSION=latest
+
+FROM matrixdotorg/synapse:${SYNAPSE_VERSION}
+
+ENV SERVER_NAME=localhost
+
+COPY conf/* /conf/
+
+# generate a signing key
+RUN generate_signing_key -o /conf/server.signing.key
+
+WORKDIR /data
+
+EXPOSE 8008 8448
+
+ENTRYPOINT ["/conf/start.sh"]
+
+HEALTHCHECK --start-period=5s --interval=1s --timeout=1s \
+    CMD curl -fSs http://localhost:8008/health || exit 1