immutablerootfstests: Overhaul the instructions
Give some more contetx about the Apertis approach to standalone tests and update the instructions to be more detailed and reflect the current status (bye bye Jenkins).
🟠 v2026dev0 entered Soft Code Freeze/Hard Feature Freeze, only bug fixes will be accepted • schedule
Give some more contetx about the Apertis approach to standalone tests and update the instructions to be more detailed and reflect the current status (bye bye Jenkins).