v0.3.12

[eafer]

This release fixes a serious data corruption bug for containers bigger
than ~1.32 TiB, which is immediately triggered by a writable mount. This
goes to show why mounts are still read-only by default.

Another much smaller data loss bug for much bigger containers (~7 TiB)
is also addressed.

Support is added for the 6.12 kernel release candidate. A bit early this
time, so let's hope the build doesn't break again for the final release.

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This discussion was created from the release v0.3.12.