Allow strings in globals.copper_thickness

kibot/globals.py

@@ -83,7 +83,7 @@ class Globals(FiltersOptions):
             self.copper_finish = None
             """ {pcb_finish} """
             self.copper_thickness = 35
-            """ Copper thickness in micrometers (1 Oz is 35 micrometers).
+            """ [number|string] Copper thickness in micrometers (1 Oz is 35 micrometers).
                 KiCad 6: you should set this in the Board Setup -> Physical Stackup """
             self.impedance_controlled = False
             """ The PCB needs specific dielectric characteristics.

tests/yaml_samples/report_simple_1.kibot.yaml

@@ -6,6 +6,7 @@ global:
   solder_mask_color_top: blue
   solder_mask_color_bottom: red
   pcb_finish: ENIG
+  copper_thickness: "35"
 
 outputs:
   - name: 'report_full'