Remove logging to /var/log and make readonly

roles/matrix-bot-maubot/templates/config/config.yaml.j2

@@ -108,12 +108,6 @@ logging:
         normal:
             format: '[%(asctime)s] [%(levelname)s@%(name)s] %(message)s'
     handlers:
-        file:
-            class: logging.handlers.RotatingFileHandler
-            formatter: normal
-            filename: /var/log/maubot.log
-            maxBytes: 10485760
-            backupCount: 10
         console:
             class: logging.StreamHandler
             formatter: colored
@@ -126,4 +120,4 @@ logging:
             level: INFO
     root:
         level: DEBUG
-        handlers: [file, console]
+        handlers: [console]

roles/matrix-bot-maubot/templates/systemd/matrix-maubot.service.j2

@@ -20,6 +20,7 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-maubot \
 			--log-driver=none \
             -e UID={{ matrix_user_uid }} \
             -e GID={{ matrix_user_gid }} \
+            --read-only \
             -v {{ matrix_bot_maubot_data_path }}:{{ matrix_bot_maubot_container_data_dir }}:z \
 			{% for arg in matrix_bot_maubot_container_extra_arguments %}
 			    {{ arg }} \