Beam — PR Review Queue II

[lauty95]

PR Against the version-15 branch

1. fix: ensure CI fails when pytest fails by adding pipefail #339 — pipefail

PR: #339 — fix: ensure CI fails when pytest fails by adding pipefail

What it does: Adds set -o pipefail to .github/workflows/pytest.yaml so the CI job actually fails when pytest fails inside a piped command (currently only the last command's exit code counts). PR body notes mobile_v15 already has this behavior — version-15 was missing it.