tests/ imports itself as "tests.*" and pulls in "capabilities" from
the sibling tasks/ dir; upstream's pyproject.toml sets
[tool.pytest] pythonpath = [".", "tasks"] to make both resolve, so
ship tasks/ and pyproject.toml into the ptest install too.
Also disable pytest's cache plugin: the non-root "tester" user ptest
runs as can't write a cache dir under the read-only-to-them
/usr/lib/python3-filelock/ptest install path.
Add python3-pytest-timeout, used by the test suite.
AI-Generated: Uses Claude Code
Signed-off-by: Khem Raj <raj.khem@gmail.com>