image_types_balena.bbclass: Double the default size of the rootfs par…

[floion]

…titions

This commit changes the default rootfs partition sizes of new devices added to balena to 640 MiB. Existing devices will need to override this value in order to keep using the old 320 MiB sizes.

Change-type: minor

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• Changes have been tested
  • Covered in automated test suite
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[floion]

All existing boards that have been using the default should now define in their device repos IMAGE_ROOTFS_SIZE to be 327680 KiB

[flowzone-app]

Website deployed to CF Pages, 👀 preview link https://b36f6694.balena-os.pages.dev

[acostach]

/deploy