fix(ci): update OIDC repo references and upgrade Node.js 20 actions

[hanzlamateen]

Gateway deploy was failing with Not authorized to perform sts:AssumeRoleWithWebIdentity because OIDC trust policies still referenced the old eliza-cloud-v2 repo name.
Also upgrades GitHub Actions flagged for Node.js 20 deprecation (forced to Node.js 24 starting June 2, 2026).

Changes

OIDC fix — repo rename eliza-cloud-v2 → cloud:

• infra/terraform/tfvars/development.tfvars / production.tfvars — github_repo
• infra/terraform/variables.tf — default value
• infra/charts/gateway-discord/values.yaml — image repository path
• infra/terraform/README.md, infra/charts/gateway-discord/README.md — trust policy examples
• infra/local/setup.sh, infra/local/smoke-test.sh — script references
• docs/ONBOARDING_INTEGRATION_PLAN.md
  Node.js 24 action upgrades:
• actions/checkout v4 → v5 (all workflows)
• aws-actions/configure-aws-credentials v4 → v6 (gateway-discord)
• docker/build-push-action v5 → v6 (gateway-discord)

Manual step required

The github-actions-gateway-terraform IAM role trust policy must be updated in AWS to reference elizaOS/cloud before this workflow can run. See terraform README for the exact policy JSON.

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Project	Deployment	Actions	Updated (UTC)
eliza-cloud-v2	Ready	Preview, Comment	Mar 17, 2026 0:21am

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