E: Repository 'http://cdn-fastly.deb.debian.org/debian testing InRelease' changed its 'Codename' value from 'buster' to 'bullseye'

[MarkEdmondson1234]

I got this error message when generating from a script that produced the start of the Dockerfile below:

FROM trestletech/plumber
LABEL maintainer="IIH-Nordic"
RUN export DEBIAN_FRONTEND=noninteractive; apt-get -y update  \
  && apt-get install -y git-core \
	libcurl4-openssl-dev \
	libssl-dev \
	make
...etc...

It seems the debian lists are updating, that I gleaned from this SO answer:
https://unix.stackexchange.com/questions/528751/cannot-update-apt-list-repository-no-longer-has-a-release-file

The answer there to add --allow-releaseinfo-change to the below worked:

 apt-get -y update --allow-releaseinfo-change

[nuest]

Thanks for reporting, and for giving a potential solution! Will take a look asap. I'll need to investigate if this is something that containerit can simply add all the time.