docker: replace config flags with env vars, drop docker param from deploy_chatmail

Remove change_kernel_settings/fs_inotify_max_user_instances_and_watchers
from chatmail.ini — use CHATMAIL_NOSYSCTL and CHATMAIL_NOPORTCHECK env
vars instead. deploy_chatmail() no longer takes a docker flag; deployers
check the env directly.

docker/chatmail_relay.dockerfile

@@ -68,7 +68,7 @@ RUN python3 -m venv /opt/cmdeploy && \
 
 RUN CMDEPLOY_STAGES=install \
     CHATMAIL_INI=/tmp/chatmail.ini \
-    CHATMAIL_DOCKER=True \
+    CHATMAIL_NOSYSCTL=True \
     /opt/cmdeploy/bin/pyinfra @local \
         /opt/chatmail/cmdeploy/src/cmdeploy/run.py -y
 
@@ -78,6 +78,7 @@ RUN rm -f /tmp/chatmail.ini
 # --- End build-time install ---
 
 ENV CHATMAIL_INI=/etc/chatmail/chatmail.ini
+ENV PATH="/opt/cmdeploy/bin:${PATH}"
 
 ARG SETUP_CHATMAIL_SERVICE_PATH=/lib/systemd/system/setup_chatmail.service
 COPY ./docker/files/setup_chatmail.service "$SETUP_CHATMAIL_SERVICE_PATH"

docker/files/setup_chatmail_docker.sh

@@ -50,7 +50,9 @@ chown opendkim:opendkim /etc/dkimkeys/opendkim.txt
 
 # Create chatmail.ini (skips if file already exists, e.g. volume-mounted)
 mkdir -p "$(dirname "$CHATMAIL_INI")"
-$CMDEPLOY init --config "$CHATMAIL_INI" $MAIL_DOMAIN || true
+if [ ! -f "$CHATMAIL_INI" ]; then
+    $CMDEPLOY init --config "$CHATMAIL_INI" $MAIL_DOMAIN
+fi
 
 export CMDEPLOY_STAGES="${CMDEPLOY_STAGES:-configure,activate}"
 $CMDEPLOY run --config "$CHATMAIL_INI" --ssh-host @docker