Support creating MBR images

[dilyn-corner]

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Request

Describe the feature you'd like to see implemented.

Currently imagecraft only supports GPT partition tables, and even then only a limited number of GUIDs.

Imagecraft should allow schema: mbr|gpt and create the right disk image accordingly.

The problem it solves

Describe the impact your request would have.

Some systems do not support GPT. This is true for both Ubuntu Core and Ubuntu Classic images.

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Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/IMAGECRAFT-111.

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