Defender deployment fails if multiple build info files have the same contract

[ericglau]

Defender deployments occur by passing the build info file containing the contract to the Defender SDK.

This plugin attempts to find the build info file by looking for the contract's source code hash within the build info directory. However, if the source code hash appears in multiple build info files, multiple build info files could be found but the result is one string concatenated by "\n". This causes an error when this string is passed to the Defender SDK.

This may be occurring in the

openzeppelin-foundry-upgrades/src/internal/Utils.sol

Line 110 in 4cd15fc

function getBuildInfoFile(

function.

We should detect this condition and give an appropriate error -- for example, with instructions to clean the project first.

Originally reported in https://forum.openzeppelin.com/t/cannot-find-option-to-do-multiple-chain-deployment-with-foundry-using-defender-v2-deploy/40708/7