After the issue in #2, I got into another one with the Dockerfile as it is:
[2/4] Fetching packages...
error express-handlebars@8.0.3: The engine "node" is incompatible with this module. Expected version ">=22.15.0". Got "22.2.0"
error Found incompatible module.
It seems that the Alpine Node image should me changed to a new released tag.
22.21.0 is the proper version.