test(e2e/pipelines): run tests on qemu runner

[maxgio92]

This PR sets the QEMU runner as the default runner for e2e tests for pipelines.
It uses the Alpine kernel, the same way we do for the Wolfi presubmit CI workflow.

Melange Pull Request Template

Functional Changes

• This change can build all of Wolfi without errors (describe results in notes)

Notes:

SCA Changes

• Examining several representative APKs show no regression / the desired effect (details in notes)

Notes:

Linter

• The new check is clean across Wolfi
• The new check is opt-in or a warning

Notes:

[maxgio92]

I think we need force merge in this case, since test failures are not related to the changes, but CVEs found on fixture packages.
cc @chainguard-dev/tools-squad

[dannf]

I didn't know we used the alpine kernel there - seems like we should allow that in the wolfi-dev/os Makefile then, w/ possibly an environment variable to override to use the CG one?

[maxgio92]

@dannf I'm not against it. I would like to have approval from @chainguard-dev/sustaining-team for managing it.
In the meantime, I would unlock this PR if possible and manage it in a separated one to introduce the alpine kernel package and make Melange CI to use it. WDYT?