ci: upgrade remaining Node.js 20 actions to Node.js 24 in gateway-discord

[hanzlamateen]

Follow-up to #395. Upgrades all remaining actions flagged for Node.js 20 deprecation in the gateway-discord workflow.

Changes

Action	Old	New
dorny/paths-filter	v3	v4
hashicorp/setup-terraform	v3	v4
docker/setup-buildx-action	v3	v4
docker/login-action	v3	v4
docker/metadata-action	v5	v6
docker/build-push-action	v6	v7

azure/setup-kubectl@v4 and azure/setup-helm@v4 kept as-is — no Node.js 24 versions available yet.

Context

After merging #395 and running the full gateway-discord pipeline via workflow_dispatch, all jobs passed (Detect Changes, Test, Build Image, Terraform, Deploy) but produced Node.js 20 deprecation warnings for the above actions. This PR clears those warnings before the June 2, 2026 forced migration.

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Project	Deployment	Actions	Updated (UTC)
eliza-cloud-v2	Ready	Preview, Comment	Mar 17, 2026 1:27am

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[claude]

Code Review

Summary: Straightforward CI maintenance PR upgrading 6 GitHub Actions to Node.js 24-compatible major versions. Changes are correct and well-scoped.

Review

Correctness ✅
All version bumps are consistent with official releases:

• dorny/paths-filter v3 → v4
• hashicorp/setup-terraform v3 → v4
• docker/setup-buildx-action v3 → v4
• docker/login-action v3 → v4
• docker/metadata-action v5 → v6
• docker/build-push-action v6 → v7

The coordinated Docker action upgrades (buildx v4, build-push v7) are compatible with each other as expected.

Scope ✅
Diff is minimal and focused — only the action version strings change, no logic affected. The gateway-webhook.yml workflow doesn't use any of these actions so nothing else needs updating.

Omissions noted ✅
The decision to keep azure/setup-kubectl@v4 and azure/setup-helm@v4 as-is is correct since no Node.js 24 versions are available for those actions yet.

Minor observation: Actions are pinned to major version tags (e.g., @v4) rather than commit SHAs. This is an existing pattern in the repo rather than something introduced here, so it's not a blocker — just worth tracking if supply-chain hardening becomes a priority.

Verdict: No issues found. Safe to merge.