[no ci] Workflow: update toolchain.yml

.github/workflows/toolchain.yml

@@ -84,6 +84,7 @@ jobs:
             sed -i "/BR2_TOOLCHAIN_EXTERNAL.*/d" ${CONFIG}
             echo BR2_PACKAGE_HOST_GDB=y >> ${CONFIG}
             echo BR2_PACKAGE_AWS_WEBRTC=y >> ${CONFIG}
+            make BOARD=${CONFIG} br-source
             make BOARD=${CONFIG} br-sdk
             SDK=$(find output/images -name *_sdk-buildroot.tar.gz)
             mv ${SDK} ${GCC}