Follow the instruction from crDroid official build guide before initializing the crDroid repository (1.2 of the guide)
After entering the initialization command:
# Install Repo in the created directory
repo init -u https://github.com/crdroidandroid/android.git -b 14.0 --git-lfs
Import this repository as a local manifest with the command:
git clone https://github.com/xiaomi-sweet2/manifest -b 14.0/crdroid --depth=1 .repo/local_manifests
Then, follow the steps of the build instructions as before