## Issue Addressed
Addresses an issue where CI could fail due to an nonexisting file error:
```
Run ./clean.sh
rm: cannot remove '/home/runner/.lighthouse/local-testnet/geth_datadir4/geth/fastcache.tmp.1549331618': No such file or directory
Error: Process completed with exit code 1.
```
This seems to happen quite frequently now, I'm not sure exactly why but perhaps worth trying suppressing the prompt?
https://github.com/sigp/lighthouse/actions/runs/5455027574/jobs/9925916159?pr=4463
## Issue Addressed
Resolves https://github.com/sigp/lighthouse/issues/2763
## Proposed Changes
- Add a workflow which tests that local testnet starts successfully
- Added `set` option into the scripts in order to fail fast so that we can notice errors during starting local testnet.
- Fix errors on MacOS
- The redirect `&>>` is supported since bash v4 but the version bundled in macOS(11.6.1) is v3. a54f119c9b
## Proposed Changes
A couple of minor fixes to the testnet scripts.
First, `clean.sh` only attempts to remove the directory if it exists. This ensures a good exit code even if the directory is not present.
Second, `setup.sh` uses an updated deposit contract address to match that in the generated spec to allow the chain to start.
