Audio Waveform for AWS Lambda

Build audiowaveform binary for AWS Lambda (Amazon Linux 2) with Docker.

# Build image
docker build -t audiowaveform .

# Run image
docker run -v /path/to/audiowaveform/bin:/audiowaveform/bin -it --rm --name audiowaveform audiowaveform

# Output
ls bin/

Thanks to ffxsam and TrevorHinesley from audiowaveform#35.