Service Azure qui fournit une plateforme de conteneur serverless à usage général.
I found the culprit.
The issue came from the docker image being host on ghcr.io, but i don't know why it was super slow to download, resulting in a timeout. I am now hosting the image on my azure container registry, which solved the issue.
However : there were no logs regarding this download timeout, resulting in not understanding what was causing the issue.