geek: increase min. storage of microSD on Turris 1.x's Btrfs migration
We decided that we will increase necessary free storage on microSD which users are using on Turris 1.x from 4 GB to 8 GB, because of these reasons:
- Turris Omnia has 8 GB internal storage
- Turris MOX, by default, has inserted a 16 GB microSD card
These days microSD cards are relatively cheap to buy in decent capacity with good I/O with the Application Performance Class. It is better to invest in a higher capacity than deal with full storage.
Also, in the past, we gave users to help them with migration to Btrfs 8 GB microSD card in some local events.
This should hopefully avoid rare cases like this https://forum.turris.cz/t/turris-os-5-2-0-is-in-hbt-testing-branch/15081/26?u=pepe but users can fullfil any microSD card in the end.