ci: build e2e image on ubuntu-22.04 to match runtime glibc

[scarmuega]

Problem

The e2e run failed in every test leg with:

oura: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.39' not found (required by oura)

Not a missing library — a glibc version mismatch. #934 switched e2e to a native build, but its build job ran on ubuntu-latest (now Ubuntu 24.04, glibc 2.39). The .github/image/Dockerfile runtime is debian:12-slim (glibc 2.36), which can't satisfy a GLIBC_2.39 symbol. The build step passed; the failure only surfaced at runtime in the test legs.

Fix

Pin the e2e build job to ubuntu-22.04 (glibc 2.35) — the same runner docker.yml already uses — so the binary's glibc floor is compatible with the debian:12 runtime. One line.

The production docker.yml image was never affected (it already builds on ubuntu-22.04). The test job stays on ubuntu-latest since it runs the image inside a container, where the host glibc is irrelevant.

Verification

Re-dispatch the e2e workflow on this branch and confirm the test legs get past image startup.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9f351b4b-815f-4803-9b9c-96b518ff2e33

📥 Commits

Reviewing files that changed from the base of the PR and between e474c08 and 5a4aee1.

📒 Files selected for processing (1)

• .github/workflows/e2e.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/e2e-fix-glibc

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