mithr4ndir · 2026-05-15T17:36:13Z

Adds actions/cache@v4 to all four CI jobs (pytest-linux, pytest-windows,
pytest-osx, flake8-linter) to cache both the Poetry tool venv (./poetry)
and the in-project dependency venv (./.venv) between runs.

What changed

POETRY_VIRTUALENVS_IN_PROJECT: "true" added as a job-level env var so
Poetry always places .venv at the project root, making the cache path
uniform across all runners.
The mkdir poetry + unconditional venv setup is replaced with a
conditional that skips recreating the tool venv when a cached one is
restored. poetry install --with dev still runs on every job to verify
the lockfile is satisfied.
Cache key: poetry-<OS>-py<python-version>-<sha256(pyproject.toml)>
Restore key: poetry-<OS>-py<python-version>- (partial match seeds the
venv, poetry install updates only what changed)

Why

On a cache miss the install step runs roughly 2 minutes on GitHub runners
(resolving and downloading ~280 MB of packages). On a cache hit it drops to
a fast lockfile verify pass. With 8 job instances per push this compounds
across the matrix.

Testing

Verified locally using act with its built-in cache server across Python
3.10, 3.11, 3.12, and 3.13:

Cache miss: full venv build, ~280 MB saved
Cache hit: cache-hit=true, install reports "No dependencies to install
or update", cache not re-saved on primary key match
271 tests passed on all four versions

Refs #1553.

Adds actions/cache@v4 to all four CI jobs in lightkurve-tests.yml, keyed on runner OS, Python version, and the pyproject.toml hash. Both the Poetry tool venv (./poetry) and the project venv (./.venv) are cached so reruns reuse resolved dependencies. POETRY_VIRTUALENVS_IN_PROJECT=true is set at the job level so Poetry installs project dependencies into ./.venv at the project root, making the cache path uniform across Linux, macOS, and Windows. The Install dependencies step now skips recreating ./poetry when a working tool venv was restored from cache. Refs lightkurve#1553. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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CI: cache Poetry tool venv and project venv across jobs - #1560