Add CP2K on Merlin7

[mikibonacci]

You can find a CP2K v2025.2 binary for Eiger-mc in "/data/project/general/mmm/4Miki” on Merlin7 (from Matthias Krack)

[mikibonacci]

As discussed with @giovannipizzi, I assigned this to @GeigerJ2 (but I can also help)