FHm this sounds like a network problem
F"connect: cannot assign requested address"
FDoes our example with a local DB work?
Fhm then it really sounds like the container can somehow not access the "internet"
Foh that is an interesting problem 
Mdo you manage to solve this issue, I'm trying with neon, db, but I have the same issue
Mbut I have a timeout related issue:
time="2025-07-03T20:00:56Z" level=error msg="failed to rollback transaction" caller="/home/runner/work/zitadel/zitadel/internal/database/database.go:58" error="sql: transaction has already been committed or rolled back"
2025-07-03T20:00:56.741872549Z time="2025-07-03T20:00:56Z" level=error msg="failed to push role permission commands" caller="/home/runner/work/zitadel/zitadel/internal/command/instance_role_permissions.go:35" error="timeout: context deadline exceeded"
2025-07-03T20:00:56.741878715Z time="2025-07-03T20:00:56Z" level=error msg="migration failed" caller="/home/runner/work/zitadel/zitadel/internal/migration/migration.go:68" error="ID=COMMA-AiV3u Message=Errors.Internal Parent=(timeout: context deadline exceeded)" name=03_default_instance
2025-07-03T20:00:57.202622882Z time="2025-07-03T20:00:57Z" level=error msg="migration failed" caller="/home/runner/work/zitadel/zitadel/cmd/setup/setup.go:355" error="ID=COMMA-AiV3u Message=Errors.Internal Parent=(timeout: context deadline exceeded)" name=03_default_instance
2025-07-03T20:00:57.203022590Z time="2025-07-03T20:00:57Z" level=fatal msg="setup failed, skipping cleanup" caller="/home/runner/work/zitadel/zitadel/cmd/setup/setup.go:124" error="migration failed: ID=COMMA-AiV3u Message=Errors.Internal Parent=(timeout: context deadline exceeded)"