Adding lwip_webserver to ci

- buil_al.py skip specific MCU if .skip.MCU_ exists
- reduce stm32f070 heap & stack size to compile webserver

hw/bsp/stm32f070rbnucleo/stm32F070rbtx_flash.ld

@@ -55,8 +55,8 @@ ENTRY(Reset_Handler)
 /* Highest address of the user mode stack */
 _estack = 0x20004000;	/* end of "RAM" Ram type memory */
 
-_Min_Heap_Size = 0x400;	/* required amount of heap  */
-_Min_Stack_Size = 0x600;	/* required amount of stack */
+_Min_Heap_Size = 0x200;	/* required amount of heap  */
+_Min_Stack_Size = 0x400;	/* required amount of stack */
 
 /* Memories definition */
 MEMORY