Generate conduit.toml instead of debian environment file

Only generate this file once. I am not sure what to do with future
upgrades yet.

debian/postinst

@@ -4,7 +4,7 @@ set -e
 . /usr/share/debconf/confmodule
 
 CONDUIT_CONFIG_PATH=/etc/matrix-conduit
-CONDUIT_CONFIG_FILE="$CONDUIT_CONFIG_PATH/debian"
+CONDUIT_CONFIG_FILE="${CONDUIT_CONFIG_PATH}/conduit.toml"
 CONDUIT_DATABASE_PATH=/var/lib/matrix-conduit
 
 case "$1" in
@@ -25,48 +25,60 @@ case "$1" in
       chown _matrix-conduit "$CONDUIT_DATABASE_PATH"
     fi
 
-    # Write the debconf values in the config.
-    db_get matrix-conduit/hostname
-    ROCKET_SERVER_NAME="$RET"
-    db_get matrix-conduit/address
-    ROCKET_ADDRESS="$RET"
-    db_get matrix-conduit/port
-    ROCKET_PORT="$RET"
-    cat >"$CONDUIT_CONFIG_FILE" << EOF
-# Conduit homeserver Debian configuration
-#
-# Conduit is an application based on the Rocket web framework.
-# Configuration of Conduit happens via Debconf (of which the resulting config
-# is in this file) and optionally by uncommenting and tweaking the variables in
-# /etc/matrix-conduit/local.
+    if [ ! -e "$CONDUIT_CONFIG_FILE" ]; then
+      # Write the debconf values in the config.
+      db_get matrix-conduit/hostname
+      CONDUIT_SERVER_NAME="$RET"
+      db_get matrix-conduit/address
+      CONDUIT_ADDRESS="$RET"
+      db_get matrix-conduit/port
+      CONDUIT_PORT="$RET"
+      mkdir -p "$CONDUIT_CONFIG_PATH"
+      cat > "$CONDUIT_CONFIG_FILE" << EOF
+[global]
+# The server_name is the name of this server. It is used as a suffix for user
+# and room ids. Examples: matrix.org, conduit.rs
+# The Conduit server needs to be reachable at https://your.server.name/ on port
+# 443 (client-server) and 8448 (federation) OR you can create /.well-known
+# files to redirect requests. See
+# https://matrix.org/docs/spec/client_server/latest#get-well-known-matrix-client
+# and https://matrix.org/docs/spec/server_server/r0.1.4#get-well-known-matrix-server
+# for more information.
+server_name = "${CONDUIT_SERVER_NAME}"
 
-# THIS FILE IS GENERATED BY DEBCONF AND WILL BE OVERRIDDEN!
-#
-# Please make changes by running:
-#
-# \$ dpkg-reconfigure matrix-conduit
-#
-# or by providing overriding changes in /etc/matrix-conduit/local.
+# This is the only directory where Conduit will save its data.
+database_path = "${CONDUIT_DATABASE_PATH}"
 
-# The server (host)name of the Matrix homeserver.
-#
-# This is the hostname the homeserver will be reachable at via a client.
-ROCKET_SERVER_NAME="$ROCKET_SERVER_NAME"
-
-# The address the Matrix homeserver listens on.
-#
+# The address Conduit will be listening on.
 # By default the server listens on address 0.0.0.0. Change this to 127.0.0.1 to
 # only listen on the localhost when using a reverse proxy.
-ROCKET_ADDRESS="$ROCKET_ADDRESS"
+address = "${CONDUIT_ADDRESS}"
 
-# The port of the Matrix homeserver.
-#
-# This port is could be any available port if accessed by a reverse proxy.
-# By default the server listens on port 8000.
-ROCKET_PORT="$ROCKET_PORT"
+# The port Conduit will be running on. You need to set up a reverse proxy in
+# your web server (e.g. apache or nginx), so all requests to /_matrix on port
+# 443 and 8448 will be forwarded to the Conduit instance running on this port.
+port = ${CONDUIT_PORT}
 
-# THIS FILE IS GENERATED BY DEBCONF AND WILL BE OVERRIDDEN!
+# Max size for uploads
+max_request_size = 20_000_000 # in bytes
+
+# Disable registration. No new users will be able to register on this server.
+#allow_registration = false
+
+# Disable encryption, so no new encrypted rooms can be created.
+# Note: Existing rooms will continue to work.
+#allow_encryption = false
+#allow_federation = false
+
+# Enable jaeger to support monitoring and troubleshooting through jaeger.
+#allow_jaeger = false
+
+#cache_capacity = 1073741824 # in bytes, 1024 * 1024 * 1024
+#max_concurrent_requests = 4 # How many requests Conduit sends to other servers at the same time
+#log = "info,state_res=warn,rocket=off,_=off,sled=off"
+#workers = 4 # default: cpu core count * 2
 EOF
+    fi
     ;;
 esac