CI: Attempt to throttle load caused by builds better

Use the support that both make and ninja have to hold back on starting new parallel jobs if load is higher than a set number.

Use the $CI_ONIRO_NUM_CPUS variable if set, or the output of nproc command to set sane values.

For most cases, this means that CI runners don't have to set anything, as nproc output should be fine.

Closes eclipse/oniro-core/meta-openharmony#33

Signed-off-by: Esben Haabendal esben.haabendal@huawei.com

recipes-openharmony/prebuilts/openharmony-3.0/patches/build-ninja_args.patch

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+Patch for //build git repository of OpenHarmony 3.0 codebase.
+
+This fixes support for using --ninja-args argument multiple times with build.sh
+script.
+
+Signed-off-by: Esben Haabendal <esben.haabendal@huawei.com>
+Upstream-Status: Pending
+
+diff --git a/build/core/build_scripts/parse_cmdline.sh b/build/core/build_scripts/parse_cmdline.sh
+index d8e351ede111..b7a49a2d04ca 100755
+--- a/build/core/build_scripts/parse_cmdline.sh
++++ b/build/core/build_scripts/parse_cmdline.sh
+@@ -33,7 +33,7 @@ parse_cmdline()
+         variant)          BUILD_VARIANT="$PARAM" ;;
+         out_dir)          OUT_DIR="$PARAM" ;;
+         gn_args)          GN_ARGS="$GN_ARGS $PARAM" ;;
+-        ninja_args)       NINJA_ARGS="$PARAM" ;;
++        ninja_args)       NINJA_ARGS="$NINJA_ARGS $PARAM" ;;
+         versionmode)      TARGET_VERSION_MODE="$PARAM" ;;
+         coverage)         COVERAGE="$PARAM" ;;
+         custom_clang)     CUSTOM_CLANG="$PARAM" ;;