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`matrix_container_images_self_build` was not really doing anything anymore. It previously was influencing `matrix_*_self_build` variables, but it's no longer the case since some time ago. Individual `matrix_*_self_build` variables are still available. People that would like to toggle self-building for a specific component ought to use those. These variables are also controlled automatically (via `group_vars/matrix_servers`) depending on `matrix_architecture`. In other words, self-building is being done automatically for all components when they don't have a prebuilt image for the specified architecture. Some components only support `amd64`, while others also have images for other architectures.
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Self-building
Caution: self-building does not have to be used on its own. See the Alternative Architectures page.
The playbook supports the self-building of various components, which don't have a container image for your architecture. For amd64, self-building is not required.
For other architectures (e.g. arm32, arm64), ready-made container images are used when available. If there's no ready-made image for a specific component and said component supports self-building, an image will be built on the host. Building images like this takes more time and resources (some build tools need to get installed by the playbook to assist building).
To make use of self-building, you don't need to do anything besides change your architecture variable (e.g. matrix_architecture: arm64). If a component has an image for the specified architecture, the playbook will use it. If not, it will build the image.
Note that not all components support self-building yet. List of roles where self-building the Docker image is currently possible:
matrix-synapsematrix-riot-webmatrix-coturnmatrix-ma1sdmatrix-mailermatrix-bridge-mautrix-facebookmatrix-bridge-mautrix-hangoutsmatrix-bridge-mx-puppet-skype
Adding self-building support to other roles is welcome. Feel free to contribute!
If you'd like to force self-building even if an image is available for your architecture, look into the matrix_*_self_build variables provided by individual roles.