I had a look to the CI.
Here is the meaning full error message.

E: Failed to fetch http://apt.postgresql.org/pub/repos/apt/dists/ trusty-pgdg /main/binary-i386/Packages

While building the environment, it try to install package from this repo.Trusty is a reference to an Ubuntu version of 2014, end of life 2019. Now postgresql is not delivering this package any more, we can see that here :

http://apt.postgresql.org/pub/repos/apt/dists/

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