Add AdGuard Home docs

[Joulinar]

DietPi-Software | AdGuard Home - add new software title

[MichaIng]

I'll merge it, so we can prepare a dev => master PR.

[Joulinar]

I need to revert my statement a little bit. It seems there is an automatic update function. However it's not working with our implementation as the updater expect the executable on same directory as the config file

Jun 22 13:31:37 DietPi4 AdGuardHome[2973]: 2021/06/22 13:31:37 [info] Updating from v0.105.2 to v0.106.3.  URL:https://static.adguard.com/adguardhome/release/AdGuardHome_linux_arm64.tar.gz
Jun 22 13:31:37 DietPi4 AdGuardHome[2973]: 2021/06/22 13:31:37 [info] executable file /mnt/dietpi_userdata/adguardhome/AdGuardHome doesn't exist

🙄

[MichaIng]

Oh, that is bad. I guess it expects it to be located in the working directory then, as this is all that we change. Strange that the related CLI option exists, when it expectedly breaks the updater 🤔. Probably something we should report to AdGuard guys, to derive the install dir form the location of the currently running executable, rather than assuming that it's located in the working directory.

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Not sure how to deal with this for our release. Leave everything in /opt/adguardhome for now or in /mnt/dietpi_userdata/adguardhome or leave the updater broken (until hopefully it is able do function with a changed working dir) and refer to reinstall?

[Joulinar]

basically we would have 3 option

1. keep everything in /opt/adguardhome
2. move everything to /mnt/dietpi_userdata/adguardhome
3. leave as is and hope behaviour will change in future

Currently AGH devs are working on v0.107 and it might be released short after our release. Means, we will have user reporting issues using the internal update function right after. For the time being, we could go with option 1, as this is similar to using AGH installation method and in parallel check with AGH developer if this intended or if they plan to split working dir from running executable. I mean you are right, using -w option is a little but useless at the moment.

[MichaIng]

FYI: AdguardTeam/AdGuardHome#3286