osmaczko b4706cd6ac
ci: reduce CI times by unifying jobs and caching Cargo artifacts
- Consolidate build and test into a single job to avoid duplicate builds;
  artifact sharing across jobs proved too complex to justify
- NBS was the main bottleneck; this change improves CI duration beyond that
- Add caching for Cargo registry, git sources, and libchat's target
2026-02-23 19:36:16 +01:00
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