Add variables & wiring to support Traefik's compression middleware

This merely hooks the playbook to the Traefik role's compression
middleware configuration (`traefik_config_http_middlewares_compression_*`)

The Traefik role enables the `compression` middleware by default.

Actual usage will land in a future commit.

group_vars/matrix_servers

@@ -35,6 +35,9 @@ matrix_playbook_traefik_labels_enabled: "{{ matrix_playbook_reverse_proxy_type i
 matrix_playbook_reverse_proxy_container_network: "{{ traefik_container_network if traefik_enabled else 'traefik' }}"
 matrix_playbook_reverse_proxy_hostname: "{{ traefik_identifier if traefik_enabled else 'traefik' }}"
 
+matrix_playbook_reverse_proxy_traefik_middleware_compession_enabled: "{{ traefik_config_http_middlewares_compression_enabled if (traefik_enabled and traefik_config_http_middlewares_compression_enabled) else false }}"
+matrix_playbook_reverse_proxy_traefik_middleware_compession_name: "{{ (traefik_config_http_middlewares_compression_middleware_name + '@file') if traefik_enabled else '' }}"
+
 # A separate Matrix Federation entrypoint is always enabled, unless the federation port matches one of the ports for existing (default) entrypoints
 matrix_playbook_public_matrix_federation_api_traefik_entrypoint_enabled: "{{ matrix_federation_public_port not in [traefik_config_entrypoint_web_port, traefik_config_entrypoint_web_secure_port] }}"
 

roles/custom/matrix-base/defaults/main.yml

@@ -239,6 +239,13 @@ matrix_playbook_reverse_proxy_container_network: 'traefik'
 # Specifies the hostname that the reverse-proxy is available at
 matrix_playbook_reverse_proxy_hostname: 'matrix-traefik'
 
+# Specifies whether the Traefik reverse-proxy (if `matrix_playbook_reverse_proxy_type` indicates that Traefik is being used) defines a compression middleware.
+matrix_playbook_reverse_proxy_traefik_middleware_compession_enabled: false
+
+# Specifies the name of the compression middleware defined for the Traefik reverse-proxy (if `matrix_playbook_reverse_proxy_type` indicates that Traefik is being used).
+# It's better to use a fully-qualified middleware name (e.g. `compression@docker` or `compression@file`) here to prevent ambiguity.
+matrix_playbook_reverse_proxy_traefik_middleware_compession_name: ''
+
 # Controls the additional network that reverse-proxyable services will be connected to.
 matrix_playbook_reverse_proxyable_services_additional_network: "{{ matrix_playbook_reverse_proxy_container_network }}"