⚡ Bolt: Cache isDocker() synchronous filesystem checks

[piyyy314]

💡 What:

The helper function isDocker() determines if the current runtime environment is a Docker container by checking /.dockerenv and /proc/self/cgroup synchronously via the filesystem. This optimization caches the result inside a module-level variable so that successive checks during a single execution bypass filesystem queries.

🎯 Why:

Environment checks like isDocker are called multiple times in various workflows of the Snyk CLI lifecycle (such as during arg parsing, analytics collection, credentials verification, and request queries). Querying the filesystem synchronously over and over degrades overall performance and increases disk overhead.

📊 Impact:

• Bypasses redundant synchronous fs.statSync() and fs.readFileSync() calls during a single process lifetime.
• Improves CLI responsiveness, especially on environments with high I/O latency or networked filesystems.

🔬 Measurement:

• Unit tests (is-docker.spec.ts) mock state and call resetIsDockerCache() in beforeEach to guarantee test isolation and verify correctness. All unit tests and formatting checks pass seamlessly.

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PR created automatically by Jules for task 16526380002677426203 started by @piyyy314

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[piyyy314]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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