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feat: upload qcow2 images (#69)

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It is now possible to upload qcow2 images. These images will be
converted to raw disk images on the cloud server.

In the CLI you can use the new `--format=qcow2` flag to upload qcow2
images. In the library you can set `UploadOptions.ImageFormat` to
`FormatQCOW2`.

Because of the underlying process, qcow2 images need to be written to a
file first. This limits their size to 960 MB at the moment. The CLI
automatically checks the file size (if possible) and shows a warning if
this limit would be triggered. The library accepts an input with the
file size and logs a warning if the limit would be triggered.

Closes #44
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Julian Tölle 2025-05-04 00:28:11 +02:00 • committed by GitHub
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This command implements a fake "upload", by going through a real server and
snapshots. This does cost a bit of money for the server.
#### Image Size
The image size for raw disk images is only limited by the servers root disk.
The image size for qcow2 images is limited to the rescue systems root disk.
This is currently a memory-backed file system with **960 MB** of space. A qcow2
image not be larger than this size, or the process will error. There is a
warning being logged if hcloud-upload-image can detect that your file is larger
than this size.