ci: cache ptoas binary and extract version to env var

[luohuan19]

• Add actions/cache@v4 step to cache the ptoas binary keyed by version and architecture, skipping download on cache hit
• Extract PTOAS_VERSION to a job-level env var (was inline in the install script) to serve as the cache key
• Rename "Clone and install simpler repository (pinned)" step label to "(stable)" to match the actual branch name being cloned

[gemini-code-assist]

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 4be86c7f-d7df-42e4-9517-5ae815cdd88a

📥 Commits

Reviewing files that changed from the base of the PR and between aeab322 and 784ad18.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✅ Files skipped from review due to trivial changes (1)

• .github/workflows/ci.yml

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📝 Walkthrough

Walkthrough

CI workflow updated to add a PTOAS version env var, cache the ptoas binary, conditionally skip installation on cache hit, and rename "simpler" clone/install step labels from "(pinned)" to "(stable)".

Changes

Cohort / File(s)	Summary
PTOAS Binary Caching ​.github/workflows/ci.yml	Added PTOAS_VERSION: v0.16 to job env, introduced actions/cache@v4 step caching ${{ github.workspace }}/ptoas-bin with a version/arch key, and made the Install ptoas step run only when cache miss occurs.
Simpler Repository Step Labels ​.github/workflows/ci.yml	Changed step labels for Clone/install simpler in system-tests and fuzz-tests-sim from "(pinned)" to "(stable)" (checkout command remains --branch stable --depth 1).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• ci: track simpler stable branch instead of pinned commit #731: Modifies the same CI workflow and adjusts the simpler repository checkout behavior/labels to track the stable branch.

Suggested reviewers

• lyfne123

Poem

🐰 I cached the ptoas, snug in a bin,
Stable branches hum, no pins to spin,
Steps skip and dance when the cache sings true,
CI hops along — a quick carrot for you! 🥕

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main changes: caching the ptoas binary and extracting PTOAS_VERSION to an environment variable, which are the primary improvements in this CI workflow optimization.
Description check	✅ Passed	The description is directly related to the changeset, providing clear details about caching the ptoas binary, extracting the version to an env var, and renaming step labels.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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