Docker Compose v2 migration

Description

About migrating to Compose v2. This affects usage on Debian trixie, but does not affect usage from Debian package, as containerized use-cases requires running from the repository.

Tasks

• Container naming:
  • Find out how Podman is behaving here, and from which version it assumes the new behavior (if so).
  • Implement either COMPOSE_COMPATIBILITY=true or detect the service container name separator to use (reference).

Time estimation

• Complexity: very small (0.5 day)
• Uncertainty: low (x1.1)
• Reference (adapted)