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I responded at https://github.com/pulumi/docs/issues/968#issuecomment-648094536, but including my response here for posterity… Try reordering your Dockerfile so that you’re updating

PATH

for Pulumi before running

pip install

When you

pip install pulumi-gcp

, part of the package installation shells out to

pulumi plugin install resource gcp <version>

to install the resource provider plugin binary, so it needs to be able to find

pulumi

on

PATH

.

Your dockerfile says

pip install "pulumi-gcp>=3.0.0,<4.0.0"

(with a dash)