* Update adguardhome-sync.sh
Better handle edge case of `curl` not being installed on Alpine.
Install `jq`, required by `fetch_and_deploy_gh_release()`, which if not installed makes the script error out with confusing stuff
Rewritten `get_ip()` to make it also work on busybox environments (Alpine).
* Update adguardhome-sync.sh
`jq` is installed by some code inside of `fetch_and_deploy_gh_release` for debian
So it doesn't make much sense to install it here.
We only do so for alpine, as if its not installed it breaks the script