Error using mnemonic for L2 wallet generation

[MFranceschi6]

Describe the bug
Rollup-fullnode fails to deploy the execution manager using mnemonic with error:

(node:34) UnhandledPromiseRejectionWarning: Error: missing provider
at Wallet.sendTransaction (/mnt/full-node/node_modules/ethers/wallet.js:107:19)
at ContractFactory.deploy (/mnt/full-node/node_modules/ethers/contract.js:683:28)
at Object.deployContract (/mnt/full-node/packages/rollup-full-node/src/app/util/utils.ts:120:34)
at deployExecutionManager (/mnt/full-node/packages/rollup-full-node/src/app/util/l2-node.ts:203:44)
at getExecutionManagerContract (/mnt/full-node/packages/rollup-full-node/src/app/util/l2-node.ts:183:30)
at processTicksAndRejections (internal/process/task_queues.js:86:5)

Steps to reproduce
Steps to reproduce the behavior:

1. yarn build
2. add L2_WALLET_MNEMONIC env variable to the rollup-full-node service in the docker-compose.yml
3. docker-compose up

Expected behavior
Everything starts up as exptected

Additional context
I've actually found the bug in the code:
packages/rollup-full-node/src/app/util/l2-node.ts

    ...
    else if (!!Environment.l2WalletMnemonic()) {
      wallet = Wallet.fromMnemonic(Environment.l2WalletMnemonic())
      wallet.connect(provider)
      log.info(`Initialized wallet from mnemonic. Address: ${wallet.address}`)
    }
    ...

at line 111 wallet.connect(provider) should be wallet = wallet.connect(provider)