✨ Stainless prepared a new release

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Greptile Summary

This patch release (0.22.0 → 0.22.1) fixes a CI bug where docker push was re-pushing a stale local tag instead of the freshly built multi-platform image — multi-arch buildx outputs cannot be loaded into the local Docker store, so any subsequent docker push would have sent the wrong image.

• CI workflow redesign: Buildx now pushes directly to an immutable commit-SHA tag (--push flag on the build step), the image is validated from the registry, then promoted to :latest via docker buildx imagetools create (a registry-side manifest copy that preserves the multi-arch manifest list without rebuilding).
• Cache default flipped: agentex agents build and build_agent() now default cache=True instead of False; the old default's rationale (preventing stale layers when republishing a moving :latest tag) no longer applies since the workflow now uses immutable SHA tags for the candidate before promotion.
• Version bumps: agentex-client and agentex-sdk both increment to 0.22.1 with updated changelogs and manifests.

sequenceDiagram
    participant GHA as GitHub Actions
    participant Buildx as docker buildx
    participant Registry as Container Registry
    participant Validator as Validate Step

    GHA->>Buildx: agentex agents build --push (SHA tag)
    Buildx->>Registry: Push multi-platform manifest to :sha
    GHA->>Validator: "Validate image (FULL_IMAGE=:sha)"
    Validator->>Registry: "Pull & inspect :sha"
    Validator-->>GHA: All checks passed
    GHA->>Registry: imagetools create --tag :latest :sha
    Note over Registry: :latest now points to validated :sha

_{Reviews (1): Last reviewed commit: "chore: release main" | Re-trigger Greptile}