fix(contracts): fix a deploy error in the hardhat task

[baumstern]

Description

This PR fixes the issue where the hardhat task in maci-contracts is unable to deploy the MACI contract due to it being outdated with the changes introduced in #1695 (see 'Additional Notes' below for the detailed error log).

Additionally, I added a CI job that executes the hardhat task so we can detect deployment errors earlier (see this detaction example of the new CI job).

Additional Notes

issue analysis

the error message: ERROR: TypeError: Do not know how to serialize a BigInt

cause of the error: emptyBallotRoots is bigint[] but JSON.stringify() can not handle bigint[] type

solution: casting bigint[] into string[]

detailed error log:

$ pnpm deploy:localhost

....

======================================================================
08 Deploy MACI contract
======================================================================

*** MACI ***

Network: localhost
contract address: 0xf204a4Ef082f5c04bB89F7D5E6568B796096735a
tx: 0xa2c6cdecc58c351e5db8b22942caa58d197d702f60e1468ea96c60cea8f4fbba
deployer address: 0x627306090abaB3A6e1400e9345bC60c78a8BEf57
gas price: 1000000397
gas used: 30000000

******


=========================================================
ERROR: TypeError: Do not know how to serialize a BigInt
    at JSON.stringify (<anonymous>)
    at ContractStorage.register (/home/runner/work/maci/maci/contracts/tasks/helpers/ContractStorage.ts:96:20)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async SimpleTaskDefinition.action (/home/runner/work/maci/maci/contracts/tasks/deploy/maci/08-maci.ts:112:5)
    at async Environment._runTaskDefinition (/home/runner/work/maci/maci/node_modules/.pnpm/[email protected][email protected]_@[email protected][email protected][email protected]/node_modules/hardhat/src/internal/core/runtime-environment.ts:359:14)
    at async Environment.run (/home/runner/work/maci/maci/node_modules/.pnpm/[email protected][email protected]_@[email protected][email protected][email protected]/node_modules/hardhat/src/internal/core/runtime-environment.ts:192:14)
    at async Deployment.runSteps (/home/runner/work/maci/maci/contracts/tasks/helpers/Deployment.ts:142:9)
    at async SimpleTaskDefinition.action (/home/runner/work/maci/maci/contracts/tasks/runner/deployFull.ts:29:7)
    at async Environment._runTaskDefinition (/home/runner/work/maci/maci/node_modules/.pnpm/[email protected][email protected]_@[email protected][email protected][email protected]/node_modules/hardhat/src/internal/core/runtime-environment.ts:359:14)
    at async Environment.run (/home/runner/work/maci/maci/node_modules/.pnpm/[email protected][email protected]_@[email protected][email protected][email protected]/node_modules/hardhat/src/internal/core/runtime-environment.ts:192:14) 

======================================================================
Deployer end balance:  9999.975515
Deploy expenses:  0.024484
======================================================================

Deployment has failed
 ELIFECYCLE  Command failed with exit code 1.

Related issue(s)

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[ctrlc03]

Nice, thanks for this!!