Test of `elixir_tri_barotropic_instability` broken

[benegee]

See https://github.com/trixi-framework/Trixi.jl/actions/runs/23280756434/job/67693623516

Maybe the Trixi.integrate override needs to be adapted.

[tristanmontoya]

why does this fail in Trixi.jl's downstream tests but not in TrixiAtmo.jl itself??

[tristanmontoya]

It seems to be because our tests use the released version of Trixi.jl, which doesn't incorporate the DGMulti refactor in trixi-framework/Trixi.jl@64b941e (specifically, the new solution_container added to the DGMulti cache). See #160.

[benegee]

There seems to be another issue:
https://github.com/trixi-framework/Trixi.jl/actions/runs/23297348657/job/67748265772?pr=2590

[tristanmontoya]

Yes, I guess we have to refactor our DGMulti containers to match the upstream refactor or else it breaks everything. Do we do this before or after the Trixi.jl changes get registered? If we do it before, I think it will fix Trixi.jl's CI but break our own.