oniro-image: switch image compression from bz2 to gz

This makes is faster to build images, easier to handle them, e.g. Raspberry Pi imager transparently supports .gz but not .bz2 and makes virtually no difference to the size of the image.

Remember that the actual image is already compressed, as it is stored inside the filesystem as a squashfs object.

Signed-off-by: Zygmunt Krynicki zygmunt.krynicki@huawei.com

requested review from @chaseqi and @sradakovi

requested review from @agherzan and @stefanschmidt

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• 90fb5219 - oniro-image: switch image compression from bz2 to gz

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• 09fe688a - oniro-image: switch image compression from bz2 to gz

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This is weird, for rpi4 we get both .bz2 and .gz images. We don't have this behavior for other machines.

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• 3cc5b24b - oniro-image: switch image compression from bz2 to gz

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It looks good to me. We need to update lava job templates accordingly. I will upload a patch on the repo https://git.ostc-eu.org/OSTC/infrastructure/lava/lava-config/-/tree/master/lava.ostc-eu.org/job-definitions/ci

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