refactor: upstream sync strategy with dynamic GENERAL.txt

Scripts/sync_upstream_config.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Sync GENERAL.txt from upstream davidtall/OpenWRT-CI
+# This ensures we always get the latest upstream config
+
+mkdir -p Config
+
+# Optional: Pin to a specific commit for reproducible builds
+# Set UPSTREAM_GENERAL_REF to a commit hash or branch name
+# Default: 'main' (always latest)
+UPSTREAM_GENERAL_REF="${UPSTREAM_GENERAL_REF:-main}"
+
+curl -fsSL \
+  "https://raw.githubusercontent.com/davidtall/OpenWRT-CI/${UPSTREAM_GENERAL_REF}/Config/GENERAL.txt" \
+  -o "Config/GENERAL.upstream.txt"
+
+echo "Synced GENERAL.txt from davidtall/OpenWRT-CI (${UPSTREAM_GENERAL_REF})"