[WIP] Try to fix jobs

Author: ArekBalysNordic

.gitmodules

@@ -25,6 +25,11 @@
 [submodule "third_party/jsoncpp/repo"]
 	path = third_party/jsoncpp/repo
 	url = https://github.com/open-source-parsers/jsoncpp.git
+[submodule "third_party/silabs/matter_support"]
+	path = third_party/silabs/matter_support
+	url = https://github.com/SiliconLabsSoftware/matter_support.git
+	branch = main
+	platforms = silabs,silabs_docker,unit_tests
 [submodule "editline"]
 	path = third_party/editline/repo
 	url = https://github.com/troglobit/editline.git