publish discord auto updater

README.md

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+# Discord Automatic Updater
+This is a small shell script and systemd service that automatically check for discord updates in the background. It updates Discord by editing `/usr/share/discord/resources/build_info.json` to the most recent version number - the content of the updates are installed by Discord itself when launched. 
+
+Currently, this has only been tested with the debian-based Discord package. It may work with the `.rpm` installer as well - let me know if you try it. Update the appropriate environment variables in `update-discord.sh`. 
+
+## Setup
+Run this from inside the Git repo: 
+```sh
+# move the script to a system location and make it executable
+sudo mkdir -p /usr/local/bin
+sudo cp ./update-discord.sh /usr/local/bin/update-discord
+sudo chmod 755 /usr/local/bin/update-discord
+
+# create the systemd service
+sudo cp ./update-discord.service /etc/systemd/system/update-discord.service
+
+# create the systemd timer
+sudo cp ./update-discord.timer /etc/systemd/system/update-discord.timer
+
+sudo systemctl daemon-reload
+sudo systemctl enable --now update-discord.timer
+```
+You can manually test it too:
+```sh
+# check schedule
+systemctl list-timers | grep discord
+
+# manually trigger and check logs
+sudo systemctl start update-discord.service
+journalctl -u update-discord.service
+```
+