I looked into the same thing a few months ago and nothing was quite what I was looking for (lightweight with albums and indieweb metadata) Piwigo was the most promising candidate I looked at, but I never quite got around to trying it out.
This is a helpful list:
https://alternativeto.net/software/flickr/?platform=self-hosted
I’ve been contemplating building my own photo gallery setup on top of Eleventy, though. It’s really flexible.