[Answered ]-Why do I get this error when I deploy a Django App in Railway?

Running johnnydep on your requirements.txt, shows that django-heroku depends on psycopg2:

>>> johnnydep django-heroku
2022-07-19 17:03:28 [info     ] init johnnydist                [johnnydep.lib] dist=django-heroku parent=None
2022-07-19 17:03:30 [info     ] init johnnydist                [johnnydep.lib] dist=dj-database-url>=0.5.0 parent=django-heroku
2022-07-19 17:03:32 [info     ] init johnnydist                [johnnydep.lib] dist=django parent=django-heroku
2022-07-19 17:03:37 [info     ] init johnnydist                [johnnydep.lib] dist=psycopg2 parent=django-heroku
2022-07-19 17:03:45 [warning  ] Created temporary directory: /private/var/folders/0t/p6l6_9qd15bb9qx6bq2mrt1r0000gn/T/pip-ephem-wheel-cache-q2agslxa
....

Notes:
1.) I stopped after the first match (possibly there are more dependencies).
2.) I dont know if it is sufficient to put psycopg2-binary at the beginning of your requirements.txt, to prevent psycopg2 needed to get installed.