reuse action doesn't work on the new ubuntu-slim runner

[DioEgizio]

Build container for action use: '/home/runner/work/_actions/fsfe/reuse-action/v5/Dockerfile'.
/usr/bin/docker build -t c32a2d:cbc71038aa1c464eb27fdc5ed6557882 -f "/home/runner/work/_actions/fsfe/reuse-action/v5/Dockerfile" "/home/runner/work/_actions/fsfe/reuse-action/v5"
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
Warning: Docker build failed with exit code 1, back off 3.588 seconds before retry.
/usr/bin/docker build -t c32a2d:cbc71038aa1c464eb27fdc5ed6557882 -f "/home/runner/work/_actions/fsfe/reuse-action/v5/Dockerfile" "/home/runner/work/_actions/fsfe/reuse-action/v5"
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
Warning: Docker build failed with exit code 1, back off 4.285 seconds before retry.
/usr/bin/docker build -t c32a2d:cbc71038aa1c464eb27fdc5ed6557882 -f "/home/runner/work/_actions/fsfe/reuse-action/v5/Dockerfile" "/home/runner/work/_actions/fsfe/reuse-action/v5"
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
Error: Docker build failed with exit code 1

I assume ubuntu-slim doesn't have docker? but it's a shame that you can't use it for reuse action because ubuntu-slim was made exactly for things like this

[mxmehl]

Indeed, this runs in a container rather than a VM, so no Docker-in-Docker: https://docs.github.com/en/actions/reference/runners/github-hosted-runners#single-cpu-runners

Nothing we can change easily with the current architecture I guess.