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This allows people to augment the Synapse image with custom tools and
addons without having to rebuild it from scratch.
If customizations are enabled, the playbook will build a new
`localhost/matrixdotorg/synapse:VERSION-customized` image
on top of the default one (`FROM matrixdotorg/synapse:VERSION`)
and with custom Dockerfile build steps.
For servers that self-build the Synapse image, the Synapse image will be
built first, before proceding to extend it the same way.
In the future, we'll also have easy to enable Dockerfile build steps
for modules that the playbook supports.