Server fails with ExitCode 0

[michalhosna]

When the server fails and spits out the error log, for example when the database it's not running, it exits with exit code 0.

It should fail with some non-zero code, also please avoid 126 - 165, and 255 exit codes, as those have special meaning, see https://www.tldp.org/LDP/abs/html/exitcodes.html. For start exit code 1 is generally considered as a good catch-all option.