Add syncback scripts

syncback.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+set -e
+
+ProjectRbxl="Project.rbxl"
+ProjectJsonFile="default.project.json"
+
+# Load .env file (auto-export all variables)
+if [ -f ".env" ]; then
+  set -a
+  . ./.env
+  set +a
+fi
+
+# Extract PlaceId from project json (first number after servePlaceIds line)
+PlaceId=$(grep -A1 'servePlaceIds' "$ProjectJsonFile" | grep -o '[0-9]\+')
+echo "PlaceId: $PlaceId"
+
+# Download rbxl from Roblox
+Url="https://assetdelivery.roblox.com/v1/asset/?id=$PlaceId"
+echo "Downloading $Url..."
+curl -fSL --compressed -o "$ProjectRbxl" -H "Cookie: .ROBLOSECURITY=${ROBLOSECURITY}" "$Url"
+
+if [ $# -eq 0 ]; then
+  rojo syncback --non-interactive --input "$ProjectRbxl" "$ProjectJsonFile"
+else
+  rojo syncback "$@" --input "$ProjectRbxl" "$ProjectJsonFile"
+fi