ci: plumb RPC_URL_ETHEREUM_FORK through the sol workflows

[hardyjosh]

Adds Ethereum mainnet to the fork-RPC set across rainix-sol.yaml, rainix-sol-test.yaml and rainix-manual-sol-artifacts.yaml: optional secret declaration, composite passthrough, and the ETHEREUM_RPC_URL env mapping with the same vars.* fallback as every other network.

Motivation: ST0x is adding Ethereum mainnet as a deploy + fork-test network in S01-Issuer/st0x.deploy. Its foundry.toml maps the ethereum rpc alias to ETHEREUM_RPC_URL, which these workflows previously never set. Consumers that don't set the new secret/var are unaffected (optional, falls back exactly like the existing networks).

🤖 Generated with Claude Code

https://claude.ai/code/session_01VPs1hCTxusmaSeFKvoc4Kr

Summary by CodeRabbit

• New Features
  • Added optional Ethereum fork RPC secret support to workflow-triggered Solidity jobs.
  • Passed the Ethereum RPC URL through to deployment and test steps when available, with a safe fallback if unset.

[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

Run ID: 99328408-335e-42d9-a850-42a678ba3300

📥 Commits

Reviewing files that changed from the base of the PR and between 0d86e55 and 07c9348.

📒 Files selected for processing (3)

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

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📝 Walkthrough

Walkthrough

Three GitHub Actions workflow files are updated to accept a new optional RPC_URL_ETHEREUM_FORK secret via workflow_call, which is then wired into deploy step or job environment variables (with variable/empty-string fallbacks), or forwarded into a nested workflow's secrets mapping.

Changes

RPC_URL_ETHEREUM_FORK Secret Wiring

Layer / File(s)	Summary
Manual sol artifacts deploy workflow .github/workflows/rainix-manual-sol-artifacts.yaml	Adds optional RPC_URL_ETHEREUM_FORK secret to workflow_call and sets ETHEREUM_RPC_URL env for the deploy step using secret, then variable, then empty-string fallback.
Sol test workflow env wiring .github/workflows/rainix-sol-test.yaml	Adds optional RPC_URL_ETHEREUM_FORK secret to workflow_call and sets ETHEREUM_RPC_URL in job env with fallback to the repo variable.
Sol workflow secrets forwarding .github/workflows/rainix-sol.yaml	Adds optional RPC_URL_ETHEREUM_FORK secret to workflow_call and forwards it into the test job's secrets mapping.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• rainlanguage/rainix#237: Both PRs update .github/workflows/rainix-manual-sol-artifacts.yaml to declare and wire RPC_URL_ETHEREUM_FORK as an optional workflow_call secret into the deploy step's ETHEREUM_RPC_URL environment.

🚥 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 and concisely describes the main change: threading RPC_URL_ETHEREUM_FORK through the sol workflows.
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 feat/ethereum-fork-rpc

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