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docs!: document 4.0.0 GA release and mark prior versions as tech preview
BREAKING CHANGE: Attestation on Azure is required and configured by default. Uses Trustee 1.0.0 (GA) and OSC 1.11+ for confidential containers. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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README.md

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## Major versions
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### `3.*`
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### `4.0.0`
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Version `3.*` of the pattern is currently constrained to support the general availability releases of coco.
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Version `4.0.0` uses GA releases of confidential containers: OpenShift Sandboxed Containers (OSC) `1.11.x`+ and Trustee `1.0.0`+.
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- **Breaking change:** attestation on Azure is required and configured by default.
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- Requires OpenShift 4.17+.
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The pattern has been tested on Azure for two installation methods:
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1. Installing onto an ARO cluster
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2. Self managed OpenShift install using the `openshift-install` CLI.
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### `3.*` (Tech Preview)
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> [!NOTE]
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> Versions below `4.0.0` used tech preview releases of confidential containers (OSC peer pods and Trustee).
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Version `3.*` of the pattern uses:
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- (OpenShift Sandboxed Containers Operator) `1.10.*` and above
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- Trustee `0.4.*`
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[Additional configuration](https://issues.redhat.com/browse/KATA-4107) is required to pull secrets from authenticated registries.
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### `2.*`
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### `2.*` (Tech Preview)
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Version `2.*` of the pattern is currently constrained to support:
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Version `2.*` of the pattern uses:
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- (OpenShift Sandboxed Containers Operator) `1.9.*`
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- Trustee `0.3.*`
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1. Installing onto an ARO cluster
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2. Self managed OpenShift install using the `openshift-install` CLI.
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### `1.0.0`
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### `1.0.0` (Tech Preview)
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1.0.0 supports OpenShift Sandboxed containers version `1.8.1` along with Trustee version `0.2.0`.
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