Add pkg/workspace.Manager that provides Acquire/Release semantics for Git
repos. When GIT_CACHE_DIR is set and a GitRepository has spec.cache.enabled,
controllers use on-disk bare clones with incremental fetch; otherwise they
fall back to the existing in-memory clone behavior.
Key changes:
- New pkg/workspace package with Manager, Workspace, GC, Deepen, and
context-based injection (WithManager/GetManager)
- GitRepository API gains spec.cache (CacheConfig) and status.cache
(CacheStatus) with deepcopy and CRD schema updates
- Push, sync, and resolver reconcilers now use workspace.Acquire/Release
instead of inline memory.NewStorage + git.CloneContext
- Shallow clone by default; sync/resolver deepen as needed for merge-base
- New Prometheus metrics: workspace_acquire_duration_seconds,
workspace_cache_hit_total, workspace_cache_miss_total
- Deployment manifests include commented-out PVC configuration
- Comprehensive unit tests for workspace package (21 tests)
- E2E tests for cache-free and cache-enabled push flows
https://claude.ai/code/session_01NULGxaCLPMT1yDVEAsffc5
