This commit accept IPv6 nodes submission.
When user submit new public node, the server will check IP addresses
from given hostname. If host IP addresses doesn't have IPv4, it will
be recorded as "IPv6 only" node.
Probers that support IPv6 may add `IPV6_CAPABLE=true` to the `.env`
file.
Please note that this feature still experimental and may not being
merged to the main branch.
The log level for the apps is using `log/slog` from Go standard library.
This commit change log format for fiber http logger to match with
the slog standard log format (date and time).
This commit also remove `APP_DEBUG` field from config struct.
TODO:
Use `slog` for default app output. Note that in this commit, the `slog`
output only implemented in `cron` "db migrate" and probe client.
Please note that this commit is not complete. I commit to the repo
because I have something to do with my another project. Just don't
want to lost my work for the last couple hours.
