lxd: Don't assume user ID to 1000 for raw.idmap

Merged fix for LXD raw.idmap that incorrectly assumed user ID 1000. Resolves bug 1700703. Approved by reviewers and validated across environments.

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Fixes: [bug 1700703](https://bugs.launchpad.net/snapcraft/+bug/1700703)

Date	Model	Scores	Action	Summary
2026-07-23 12:50 PM UTC	qwen/qwen3.6-35b-a3b	—	—	Merged fix for LXD raw.idmap that incorrectly assumed user ID 1000. Resolves bug 1700703. Approved by reviewers and validated across environments.
2026-07-20 05:49 AM UTC	qwen3.6-35b-a3b-mtp-q6	—	—	Merged contributor branch fixing LXD raw.idmap UID mapping assumption. Resolves bug 1700703 after cross-environment verification and testing.
2026-06-28 10:02 PM UTC	qwen3.6-35b-a3b-mtp-q6	—	—	Merged a fix for LXD raw.idmap that incorrectly assumed user ID 1000. Resolves Launchpad bug 1700703. Prevents container startup failures by correctly handling user namespace mapping.

No update history recorded yet.

Issue	Project	State	Summary	Similarity
#1629 lxd: fix the unit test for the user id map	snapcraft	merged	Merged a fix for an LXD unit test failure when run as root, introduced in #1588. Adjusts the user ID map test logic. Approved by two reviewers and passed CI. One remaining test error was noted but did not block the merge.	79%
#1904 lxd: raw.idmap expects host and container id respectively	snapcraft	merged	Merged a fix correcting raw.idmap syntax in LXD configuration. The change maps host and container IDs correctly, preventing container files from being owned by root. Resolves LP: #1741753 with a four-line adjustment across two files.	78%
#1588 lxd: use SUDO_UID for ID mapping	snapcraft	merged	Merged a one-file change implementing SUDO_UID for LXD ID mapping, resolving bug 1719996. The pull request passed CI, received approval from one reviewer with no unresolved comments, and was successfully integrated.	78%