Add conditional restart support to service roles
Track config/image/systemd changes via register: directives and compute a _restart_necessary variable for each service role, allowing the systemd_service_manager to skip unnecessary restarts during install-* runs. Covers 22 service roles: alertmanager-receiver, appservice-draupnir-for-all, bridge-mautrix-wsproxy (+ syncproxy), cactus-comments, cactus-comments-client, corporal, element-admin, ldap-registration-proxy, livekit-jwt-service, matrixto, pantalaimon, prometheus-nginxlog-exporter, rageshake, registration, static-files, sygnal, synapse-admin, synapse-auto-compressor, synapse-reverse-proxy-companion, synapse-usage-exporter, and user-verification-service. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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@@ -167,3 +167,13 @@ matrix_registration_configuration_extension: "{{ matrix_registration_configurati
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# Holds the final matrix-registration configuration (a combination of the default and its extension).
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# You most likely don't need to touch this variable. Instead, see `matrix_registration_configuration_yaml`.
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matrix_registration_configuration: "{{ matrix_registration_configuration_yaml | from_yaml | combine(matrix_registration_configuration_extension, recursive=True) }}"
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# matrix_registration_restart_necessary controls whether the service
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# will be restarted (when true) or merely started (when false) by the
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# systemd service manager role (when conditional restart is enabled).
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#
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# This value is automatically computed during installation based on whether
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# any configuration files, the systemd service file, or the container image changed.
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# The default of `false` means "no restart needed" — appropriate when the role's
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# installation tasks haven't run (e.g., due to --tags skipping them).
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matrix_registration_restart_necessary: false
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