[suggestion] use ping to do health tests on gluetun/piavpn pods

[funkypenguin]

🤪 Sanity check

• I have searched and confirmed no existing open / closed issues, or open / closed PRs exist for this suggestion

🤕 What's not right?

Sometimes the PIA VPN container can go "stale", and stop passing traffic. The pod stays up and healthy though, so it never self-recovers

🤯 Here's my idea!

Change the healthtest to use a ping to the remote VPN endpoint (possibly wrapped in a script for session-specific details)

🤔 On the other hand..

The container may have built-in healthtests which we're not using, we should confirm first :)

🤩 But will it fly?

This should work without user intervention - it'll just restart the gluetun pod if the VPN fails

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