ci: make bringup process for check_build_test_rules.py more friendly

.gitlab/ci/build.yml

@@ -211,6 +211,7 @@ build_non_test_components_apps:
   extends:
     - .build_cmake_template
     - .rules:build:component_ut
+  parallel: 2
   script:
     - set_component_ut_vars
     # CI specific options start from "--collect-size-info xxx". could ignore when running locally

.gitlab/ci/default-build-test-rules.yml

@@ -0,0 +1,21 @@
+# this file support two keywords:
+# - extra_default_build_targets:
+#     besides of the SUPPORTED_TARGETS in IDF,
+#     enable build for the specified targets by default as well.
+# - bypass_check_test_targets:
+#     suppress the check_build_test_rules check-test-script warnings for the specified targets
+#
+# This file should ONLY be used during bringup. Should be reset to empty after the bringup process
+#
+# Take esp32c6 as an example:
+#
+#extra_default_build_targets:
+#  - esp32c6
+#
+#bypass_check_test_targets:
+#  - esp32c6
+#
+# These lines would
+# - enable the README.md check for esp32c6. Don't forget to add the build jobs in .gitlab/ci/build.yml
+# - disable the test script check with the manifest file.
+#