fix iar ci

tools/build_cmake.py

@@ -61,7 +61,7 @@ def build_family(family, toolchain_option):
 
         if os.getenv('CI'):
             # always print build output if in CI
-            print(f"::group::{title} build error")
+            print(f"::group::{title}")
             print(r.stdout.decode("utf-8"))
             print(f"::endgroup::")
         else:

tools/build_utils.py

@@ -47,6 +47,7 @@ def skip_example(example, board):
 
         mk_contents = board_mk.read_text()
 
+    mcu = "NONE"
     for token in mk_contents.split():
         if "CFG_TUSB_MCU=OPT_MCU_" in token:
             # Strip " because cmake files has them.