feat: add support for blockscout in VerifyOPCM (cherry-pick)

[JosepBove]

Summary

Cherry-pick of #18373 from develop to proposal/op-safe-contracts/v1.0.0.

• Adds support for blockscout verification in VerifyOPCM

Original commit: 35bd6ef

[graphite-app]

Malformed curl command when blockscoutApiUrl() returns empty string for unsupported chains. If the chain ID is not in the hardcoded list in Config.blockscoutApiUrl() and BLOCKSCOUT_API_URL environment variable is not set, the function returns an empty string. This results in an invalid curl URL like curl -s '/api?module=... which will fail.

// Add validation before using the URL:
string memory apiUrl = Config.blockscoutApiUrl();
require(bytes(apiUrl).length > 0, "Blockscout API URL not configured for this chain");
cmd = string.concat(
    "curl -s '",
    apiUrl,
    "/api?module=contract&action=getcontractcreation&contractaddresses=",
    vm.toString(_addr),
    "' | jq -r '.result[0].creationBytecode'"
);

Suggested change

	cmd = string.concat(
	"curl -s '",
	Config.blockscoutApiUrl(),
	"/api?module=contract&action=getcontractcreation&contractaddresses=",
	vm.toString(_addr),
	"' | jq -r '.result[0].creationBytecode'"
	);
	string memory apiUrl = Config.blockscoutApiUrl();
	require(bytes(apiUrl).length > 0, "Blockscout API URL not configured for this chain");
	cmd = string.concat(
	"curl -s '",
	apiUrl,
	"/api?module=contract&action=getcontractcreation&contractaddresses=",
	vm.toString(_addr),
	"' | jq -r '.result[0].creationBytecode'"
	);

Spotted by Graphite Agent



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