Add CI workflow and offline-aware startup

startup.sh

@@ -16,7 +16,11 @@ DEFAULT_MODULE="scripts.lagged_oil_unrate_chart_styled"
 
 # 1) Ensure pip & setuptools are up to date
 echo "🛠 Upgrading pip & setuptools…"
-pip install --upgrade pip setuptools
+if [[ "${PIP_NO_INDEX:-}" == "1" ]]; then
+  echo "🔒 Offline mode detected; skipping upgrade"
+else
+  pip install --upgrade pip setuptools
+fi
 
 # 2) Install project dependencies globally
 echo "📦 Installing dependencies from $REQ_FILE…"