rainix-sol test workflow: add RPC_URL_HYPEREVM_FORK secret slot

[hardyjosh]

The manual sol-artifacts workflow gained a HyperEVM RPC slot in #279, but the shared test workflow (rainix-sol.yaml → rainix-sol-test.yaml) did not — so callers' HyperEVM fork tests can never see HYPEREVM_RPC_URL in PR CI and stay env-gated.

This declares RPC_URL_HYPEREVM_FORK (optional, like the other fork RPCs) on rainix-sol.yaml, forwards it to the test job, and maps it to HYPEREVM_RPC_URL alongside the other fork RPC env vars. No behaviour change for callers that don't set the secret.

Unblocks S01-Issuer/st0x.deploy HyperEVM fork tests (RAI-1511).

🤖 Generated with Claude Code

https://claude.ai/code/session_01VPs1hCTxusmaSeFKvoc4Kr

Summary by CodeRabbit

• Chores
  • Added optional HyperEVM fork RPC configuration to automated testing workflows.
  • Supports sourcing the RPC URL from either a configured secret or repository variable.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 48f0da5a-11f9-4a8e-bcad-46b596d9f85e

📥 Commits

Reviewing files that changed from the base of the PR and between aa789b9 and 7e8741e.

📒 Files selected for processing (2)

• .github/workflows/rainix-sol-test.yaml
• .github/workflows/rainix-sol.yaml

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📝 Walkthrough

Walkthrough

The Solidity GitHub Actions workflows now support an optional Hyperevm fork RPC secret, forward it to the test job, and expose it as HYPEREVM_RPC_URL with a repository-variable fallback.

Changes

Hyperevm RPC configuration

Layer / File(s)	Summary
Add and propagate Hyperevm RPC secret .github/workflows/rainix-sol.yaml, .github/workflows/rainix-sol-test.yaml	Both workflows declare the optional RPC_URL_HYPEREVM_FORK secret. The test workflow forwards it to HYPEREVM_RPC_URL, falling back to the repository variable when the secret is unavailable.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• rainlanguage/rainix#237: Adds and forwards another optional fork RPC workflow secret.
• rainlanguage/rainix#274: Extends the same Solidity workflows with an Ethereum fork RPC secret.
• rainlanguage/rainix#279: Adds the same Hyperevm RPC forwarding to the manual Solidity artifacts workflow.

Suggested reviewers: thedavidmeister, claude

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding the RPC_URL_HYPEREVM_FORK secret slot to the rainix-sol test workflow.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-07-24-hyperevm-fork-rpc-test-workflow

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