I think I “fixed” it, I was missing a .dockerignore file, the file has following contents:
.tmp/
.cache/
.git/
build/
node_modules/
.env
data/
now after the rebuild, it seems to work. 
I think I “fixed” it, I was missing a .dockerignore file, the file has following contents:
.tmp/
.cache/
.git/
build/
node_modules/
.env
data/
now after the rebuild, it seems to work. 