update docker-compose to add healthcheck

src/main.py

@@ -40,6 +40,13 @@ if "API_KEY" in ENV:
 else:
         logger.error("API_KEY not found in .env file... cannot continue.")
         exit()
+try:
+        with psycopg.connect(connect_statement) as conn:
+                with conn.cursor() as cur:
+                        cur.execute("SELECT 1")
+except Exception as error:
+        logger.error("Failed to connect to PostgreSQL: {}", error)
+        exit()
 
 with psycopg.connect(connect_statement) as conn:
         with conn.cursor() as cur: