Upgrade NixOS to 26.05 channel

[amezin]

No description provided.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 047e4c61-5232-40d4-81ff-9a07c814cc58

📥 Commits

Reviewing files that changed from the base of the PR and between c176bf3 and 59ae6b7.

⛔ Files ignored due to path filters (1)

• test/ref/nixos.png is excluded by !**/*.png

📒 Files selected for processing (1)

• nixos.pkr.hcl

📜 Recent review details

🔇 Additional comments (1)

nixos.pkr.hcl (1)

2-3: LGTM!

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated base NixOS version from 25.11 to 26.05 in the build configuration, resulting in newer system images for builds.

Walkthrough

Update NixOS build version from 25.11 to 26.05 in the Packer configuration. This version string change updates the pinned build and affects downstream NixOS channel and ISO/checksum URL derivations.

Changes

NixOS Version Update

Layer / File(s)	Summary
NixOS build version update nixos.pkr.hcl	The locals.nixos_build version string is updated from 25.11.9840.a4bf06618f0b to 26.05.889.b51242d7d436, changing the pinned NixOS release and affecting the computed NixOS channel and ISO/checksum URLs.

🎯 2 (Simple) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No description was provided by the author, making it impossible to assess relevance to the changeset.	Add a brief description explaining the rationale for upgrading to NixOS 26.05 and any testing performed.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: upgrading NixOS from 25.11 to 26.05 channel as shown in the nixos_build variable update.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch nixos-26.x

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