[CI] Update configs

Author: fpistm

CI/build/conf/cores_config.json

@@ -66,6 +66,7 @@
             "HY_TinySTM103TB",
             "MALYANM200_F070CB",
             "MALYANM200_F103CB",
+            "MALYANM300_F070CB",
             "MAPLEMINI_F103CB",
             "NUCLEO_L031K6",
             "NUCLEO_L412KB",
@@ -160,6 +161,7 @@
             "HY_TinySTM103TB",
             "MALYANM200_F070CB",
             "MALYANM200_F103CB",
+            "MALYANM300_F070CB",
             "MAPLEMINI_F103CB",
             "NUCLEO_F303K8",
             "NUCLEO_G431KB",