Set group ownership of systemd service config dir

Also mention that linking to config files is possible

SETUP.md

@@ -56,10 +56,11 @@ To use them as-is, follow these steps after [initial setup](#initial-setup):
         1. Copy/link the service files to a directory in the system unit search path, such as `/etc/systemd/system/`
         1. Create the services' configuration directory with `sudo mkdir /etc/matrix-appservice-kakaotalk`
         1. RECOMMENDED: Create the `matrix-appservice-kakaotalk` user on your system with `adduser` or an equivalent command, then uncomment the `User` and `Group` lines in the service files
+            * If creating this user, also give it write permissions on the services' configuration directory with `chgrp matrix-appservice-kakaotalk /etc/matrix-appservice-kakaotalk && chmod g+w /etc/matrix-appservice-kakaotalk`
     * To install as user units:
         1. Copy/link the service files to a directory in the user unit search path, such as `~/.config/systemd/user`
         1. Create the services' configuration directory with `mkdir $XDG_CONFIG_HOME/matrix-appservice-kakaotalk`
-1. Copy the bridge & node-kakao module configuration files to the services' configuration directory as `config.yaml` and `node-config.json`, respectively
+1. Copy/link the bridge & node-kakao module configuration files to the services' configuration directory as `config.yaml` and `node-config.json`, respectively
 1. Start the services now and on every boot boot with `[sudo] systemd [--user] enable --now matrix-appservice-kakaotalk{,-node}`
 
 ## Upgrading

systemd/matrix-appservice-kakaotalk-node.service

@@ -9,6 +9,7 @@ Type=notify
 NotifyAccess=all
 WorkingDirectory=/opt/matrix-appservice-kakaotalk/node
 ConfigurationDirectory=matrix-appservice-kakaotalk
+ConfigurationDirectoryMode=775
 RuntimeDirectory=matrix-appservice-kakaotalk
 RuntimeDirectoryPreserve=yes
 ExecStart=/usr/bin/env node src/main.js --config ${CONFIGURATION_DIRECTORY}/node-config.json

systemd/matrix-appservice-kakaotalk.service

@@ -7,6 +7,7 @@ After=multi-user.target network.target
 ; Group=matrix-appservice-kakaotalk
 WorkingDirectory=/opt/matrix-appservice-kakaotalk
 ConfigurationDirectory=matrix-appservice-kakaotalk
+ConfigurationDirectoryMode=775
 RuntimeDirectory=matrix-appservice-kakaotalk
 RuntimeDirectoryPreserve=yes
 ExecStart=/opt/matrix-appservice-kakaotalk/.venv/bin/python -m matrix_appservice_kakaotalk -c ${CONFIGURATION_DIRECTORY}/config.yaml