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I solved this.


there were two issues:
a) for some reason, it was not okay to use yarn to install the packages, it had to be npm
b) one variable (tenant id) was not set correctly

the dockerfile might of interest to anyone else doing devops with scripts:
a) by using a docker image that installs the dependencies you save some time in the build (pulumi is not part of the image because it updates fairly often)
b) the nodeversion referenced in the documentation is out-dated, the dockerfile corrects that
c) the script example in the documentation doesn't install az-cli, but you need it - the dockerfile does this, too
d) the script example in the documentation assumes every container image can sudo. but if you use MS images for NET, you cannot because sudo is not installed; the dockerfile circumvents this by just setting the root user