Before building and using this docker image to compile WebRTC source code for Android, it's better to setup proxy locally (e.g., by configuring ~/.docker/config.json).
Users are required to fetch Chromium depot tools and WebRTC source code first. A guide.
Build docker image
bash build-docker-image.sh
Run docker image at current folder containing depot_tools/ and src/
docker run -v $(pwd):/webrtc-android -it --rm centos8:webrtc bash
Compile WebRTC to generate one aar file
tools_webrtc/android/build_aar.py --arch arm64-v8a --verbose
Note: To compile aar file that can be used in Unity project, follow the guides in com.unity.webrtc project.