[Django] flyctl deploy fails with: Error failed to fetch an image or build from source: error building: executor failed running pip install

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You can see its a psycopg error, try this Django 4.2 + Psycopg3 issues

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It’s also the case that if you’re using psycopg2 and not the binary version you’ll need to install additional packages such as libpq. Best to try the binary version first in that LearnDjango post and go from there.