Use Discord canary deb instead of Flatpak

roles/discord-canary/files/update-discord

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -eu
+
+SCRIPT_PATH=$(dirname "${BASH_SOURCE[0]}")
+CACHE_FILE_PATH="$SCRIPT_PATH/.discord_version_cache"
+
+CURRENT_VERSION=$(curl -s "https://discord.com/api/updates/canary?platform=linux" | jq -r .name)
+INSTALLED_VERSION=""
+
+if test -f "$CACHE_FILE_PATH"; then
+  INSTALLED_VERSION=$(head -n 1 "$CACHE_FILE_PATH")
+fi
+
+if [ "$CURRENT_VERSION" != "$INSTALLED_VERSION" ]; then
+  echo "New version $CURRENT_VERSION found. Downloading..."
+  curl -Ls -o /tmp/discord-canary.deb "https://discord.com/api/download/canary?platform=linux&format=deb"
+  if [ ${1-default} != "--download-only" ]; then
+    pkexec apt install -y /tmp/discord-canary.deb
+    rm /tmp/discord-canary.deb
+  fi
+  echo $CURRENT_VERSION > $CACHE_FILE_PATH
+else
+  echo "Current version is already installed."
+  if [ ${1-default} == "--download-only" ]; then
+    exit 2
+  fi
+fi