fix(ci): add libxml2-dev to e2e image and disable Swift SPM tests

[jdx]

Summary

• Add libxml2-dev to e2e Docker image
• Disable SPM tests in test_swift_slow: Swift 24.04 binaries link against libxml2.so.2 but Ubuntu 26.04 ships libxml2.so.16 (ABI mismatch). SPM tests will fail until Swift provides native 26.04 binaries.

Test plan

• Confirmed ABI mismatch: Swift's swift-package expects libxml2.so.2, Ubuntu 26.04 has libxml2.so.16
• Swift install + swift --version still works (only SPM is broken)

🤖 Generated with Claude Code

---

Note

Low Risk
Low risk CI-only change: adjusts e2e Docker dependencies and temporarily skips failing Swift SPM assertions due to an Ubuntu 26.04/libxml2 ABI mismatch.

Overview
Updates the e2e test environment to install libxml2-dev (replacing libxml2) in packaging/e2e/Dockerfile.

Temporarily disables the Swift SPM-based SwiftFormat assertions in e2e/core/test_swift_slow, documenting an Ubuntu 26.04 libxml2 ABI mismatch until Swift ships compatible binaries.

^{Reviewed by Cursor Bugbot for commit e7e8691. Bugbot is set up for automated code reviews on this repo. Configure here.}

[gemini-code-assist]

Warning

You have reached your daily quota limit. Please wait up to 24 hours and I will start processing your requests again!

[greptile-apps]

Greptile Summary

This PR fixes a CI compatibility issue when running e2e tests on Ubuntu 26.04 by adding libxml2-dev to the Docker test image and disabling Swift SPM tests that fail due to an ABI mismatch between Swift's Ubuntu 24.04 binaries (which expect libxml2.so.2) and Ubuntu 26.04 (which ships libxml2.so.16).

• packaging/e2e/Dockerfile: Adds libxml2-dev to the apt package list, correctly inserted in alphabetical order between libicu-dev and libncurses-dev
• e2e/core/test_swift_slow: Comments out spm: backend tests with a clear TODO explaining the Ubuntu 26.04/libxml2 ABI mismatch; the Swift install and swift --version assertion still run to confirm the core tool works correctly
• PR title note: Per project conventions in CLAUDE.md, fix: is reserved for "Bug fixes that affect the CLI behavior (not CI, docs, or infrastructure)" while CI/infrastructure changes should use chore:. The title chore(ci): ... would be more consistent with project conventions, though the underlying fix is correct regardless.

Confidence Score: 5/5

Safe to merge — minimal, well-documented CI infrastructure fix with no changes to mise core logic.

Both changes are small and focused: a single package addition to the Dockerfile (alphabetically placed) and commented-out tests with a clear TODO. The root cause (ABI mismatch) is well-documented in the PR description and inline comments, and the Swift core install test still runs to verify the tool works.

No files require special attention.

Important Files Changed

Filename	Overview
e2e/core/test_swift_slow	Disables SPM tests that fail due to libxml2 ABI mismatch between Swift 24.04 binaries and Ubuntu 26.04; core Swift install/version assertion still runs
packaging/e2e/Dockerfile	Adds libxml2-dev alphabetically to the apt install list in the Ubuntu 26.04 e2e Docker image

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Ubuntu 26.04 e2e Docker Image] --> B[apt install ... libxml2-dev ...]
    B --> C[Run test_swift_slow]
    C --> D[mise use swift@6]
    D --> E[assert swift --version]
    E --> F{SPM tests}
    F -->|DISABLED - ABI mismatch| G[Swift 24.04 expects libxml2.so.2\nUbuntu 26.04 ships libxml2.so.16]
    G --> H[TODO: Re-enable when Swift\nprovides native Ubuntu 26.04 binaries]

Loading

_{Reviews (1): Last reviewed commit: "fix(ci): add libxml2-dev to e2e image an..." | Re-trigger Greptile}

[github-actions]

Hyperfine Performance

mise x -- echo

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2026.4.3 x -- echo	17.2 ± 0.5	16.2	18.8	1.00
mise x -- echo	18.1 ± 0.4	17.0	19.5	1.05 ± 0.04

mise env

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2026.4.3 env	17.0 ± 0.5	16.0	22.7	1.00
mise env	17.9 ± 4.8	16.5	116.8	1.05 ± 0.28

mise hook-env

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2026.4.3 hook-env	17.5 ± 1.0	16.5	33.4	1.00
mise hook-env	18.0 ± 0.5	17.0	21.6	1.03 ± 0.07

mise ls

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2026.4.3 ls	16.1 ± 0.4	15.1	17.4	1.00
mise ls	16.8 ± 0.4	15.9	18.0	1.04 ± 0.04

xtasks/test/perf

Command	mise-2026.4.3	mise	Variance
install (cached)	115ms	114ms	+0%
ls (cached)	65ms	66ms	-1%
bin-paths (cached)	68ms	67ms	+1%
task-ls (cached)	704ms	701ms	+0%