Debian packages are not found

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https://akamai.github.io/akr-pkg/debian/ returns 404 and I cannot install akr to Debian docker image.

The related parts of my Dockerfile (Debian: bullseye):

RUN curl -SsL https://akamai.github.io/akr-pkg/debian/KEY.gpg | apt-key add - \
    && curl -SsL -o /etc/apt/sources.list.d/akr.list https://akamai.github.io/akr-pkg/debian/akr.list
RUN apt-get update \
    && apt-get install -y \
    # akr \

Some commands and results:

$ cat /etc/apt/sources.list.d/*
deb https://akamai.github.io/akr-pkg/debian ./
$ apt-cache madison akr
N: Unable to locate package akr