I’m not sure what you’re talking about. Looking up camping tents, the vast majority have the classic pitched rain fly.
But regardless, that style of rain fly is pretty new, so it’s irrelevant to the reason they were named flies in the first place. I doubt it was common for tents to even have zippers when the term rain fly was coined.
Edit: Looking into it further, the term rain fly was coined before the term fly was used to describe the fabric covering the zipper. It looks like calling the fabric covering the zipper a fly came from using fly to describe the fabric covering a tent.
Thank you for this. I’ve been struggling to get wireguard running in hotio containers on my Synology, and this looks like it might be what I need.
Edit: it worked! Had to fiddle around with it because it didn’t like multiple containers in one compose yaml