[openstreetmap/openstreetmap-website] Migrations don't run in CI with rails 8 (Issue #5847)

[Andy Allan]

gravitystorm created an issue (openstreetmap/openstreetmap-website#5847)

We have code to run the migrations in CI, mostly to make sure that when they run, they produce the same results as structure.sql

When we upgraded to Rails 8, however, these migrations no longer run. I believe it's because, if rails spots an empty database, it now ignores the migrations and just runs the structure - but I'm not yet certain on that.

Here's two CI runs to compare, [before](https://github.com/openstreetmap/openstreetmap-website/actions/runs/13957644201/job/39072542124) and [after](https://github.com/openstreetmap/openstreetmap-website/actions/runs/14069719853/job/39400815755) the rails 8 upgrade

![Image](https://github.com/user-attachments/assets/cde31140-1a02-4f85-91c6-add60c8f9aab)

![Image](https://github.com/user-attachments/assets/02ed4d55-557b-4eef-9dba-caf64a566554)

We need to figure out how to make rails 8 actually run the migrations.

(This new behaviour also masked #5845 / #5846 from being detected by CI)

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