Add workflow for OCI AWS tests & document the setup · fluxcd/pkg@5471937

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/setup-go@4d34df0c2316fe8122ab82dc22947d607c0c91f9. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

Unexpected input(s) 'version', valid inputs are ['k8s_version', 'envtest_version']

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