fix: :hammer: start script permissions & environment

backend/start.sh

@@ -1 +1,3 @@
-uvicorn main:app --host 0.0.0.0 --port 8080 --forwarded-allow-ips '*'
+#!/usr/bin/env bash
+
+uvicorn main:app --host 0.0.0.0 --port 8080 --forwarded-allow-ips '*'