add a PORT_OVERRIDE env var

src/anchor_pkg/anchor_pkg/anchor_node.py

@@ -66,7 +66,8 @@ class SerialRelay(Node):
 
         # Loop through all serial devices on the computer to check for the MCU
         self.port = None
-        # self.port = "/tmp/ttyACM9"  # Fake port, for debugging
+        if port_override := os.getenv("PORT_OVERRIDE"):
+            self.port = port_override
         ports = SerialRelay.list_serial_ports()
         for i in range(4):
             if self.port is not None: