fix: prevent overwrite existing l2 addresses

[parketh]

Summary

This PR prevents overwrite of existing generated L2 addresses at the make l2-prepare step.

Currently, if the Ansible script execution fails at any step, re-executing the script will override existing addresses and cause funds to be lost.

Test plan

# run ansible
ansible-playbook -i ini/l2.ini playbooks/debian_op_babylon_devnet_l2.yml

# or run the script
make l2-gen-addresses

script logs

make l2-gen-addresses                                                                                       ─╯
Addresses already exist in .env file. Backing up and running teardown.
Draining ADMIN address: 0x9880E4428DF1428688E144997C66A6D5C06cb2bC
Existing balance: 0
Gas cost (+50% buffer): 1028205366795000
Gas cost exceeds balance, skipping...

Draining BATCHER address: 0x38a24855D71c6269BC0e3259403a98Bc11486e8b
Existing balance: 0
Gas cost (+50% buffer): 1028205366795000
Gas cost exceeds balance, skipping...

Draining PROPOSER address: 0x06e978948df8dFC0460814DcF189Bd343A32878f
Existing balance: 0
Gas cost (+50% buffer): 1028205366795000
Gas cost exceeds balance, skipping...

Draining complete.
Teardown complete.
Generated new addresses and updated .env file.
Funding ADMIN address: 0x18B66e27Db710cD5bCEC9C015A68909054D0eEdc with amount 0.1ether

blockHash               0xbfb747557e2f59fb6ca47edf35279daab93fec046d51af5b3a06be1adcde021c
blockNumber             7130243
contractAddress
cumulativeGasUsed       16952369
effectiveGasPrice       22571642853
from                    0xD417DEFFAA4185E88A07e9a16Bc736CA72dEB6bC
gasUsed                 21000
logs                    []
logsBloom               0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
root
status                  1 (success)
transactionHash         0x566268c6df98945d80e5636bd07e5bae8a80a5a31774399f5a8a76533d89a0a8
transactionIndex        257
type                    2
blobGasPrice
blobGasUsed
authorizationList
to                      0x18B66e27Db710cD5bCEC9C015A68909054D0eEdc

Funding BATCHER address: 0xB042e1451778A3FD88947e037f9B606025a58801 with amount 0.1ether

blockHash               0xf177c4ee4d947889aef5e6841e7b3e52becb1dcbcf7b0dd251df65d8b03862af
blockNumber             7130244
contractAddress
cumulativeGasUsed       9725228
effectiveGasPrice       24116362790
from                    0xD417DEFFAA4185E88A07e9a16Bc736CA72dEB6bC
gasUsed                 21000
logs                    []
logsBloom               0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
root
status                  1 (success)
transactionHash         0x52d64ec7415ff9358f76d7199a2108c15768a223a5244463e271f06aa846c086
transactionIndex        174
type                    2
blobGasPrice
blobGasUsed
authorizationList
to                      0xB042e1451778A3FD88947e037f9B606025a58801

Funding PROPOSER address: 0xC8002d2B06520CBD0b669d0e4e1F71524c829f5D with amount 0.1ether

blockHash               0xf82599a133f8350f14c8bc2b0382c0ca75c968892ea1a48b3b5ae4c41225f37f
blockNumber             7130245
contractAddress
cumulativeGasUsed       6782698
effectiveGasPrice       23489796832
from                    0xD417DEFFAA4185E88A07e9a16Bc736CA72dEB6bC
gasUsed                 21000
logs                    []
logsBloom               0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
root
status                  1 (success)
transactionHash         0x2c8844e93530a3485968885c850f30d1265917edd36a66f206bb3e0ac83c1c83
transactionIndex        104
type                    2
blobGasPrice
blobGasUsed
authorizationList
to                      0xC8002d2B06520CBD0b669d0e4e1F71524c829f5D

Funding complete.

[bap2pecs]

it might be inconvenient to require manual removing the keys in cases such as the deployment failed in the middle and we want to start from scratch. maybe add a flag to allow overwrite?

[parketh]

how about:

• if existing keys exist, check if they are funded
• if funded, run teardown
• backup keys to another file, e.g. .env.bak-202411200953
• overwrite keys and continue script execution

[bap2pecs]

yeah let's do that.

[parketh]

tested this, now ready for review @bap2pecs