This reminded me of a very similar one but for the desktop from a few years back. Here you go;
Source at https://github.com/responsively-org/responsively-app
Source at https://github.com/responsively-org/responsively-app
There's not yet a way to resize the viewport and take another screenshot without loading the page again.
There's not yet a way to store (h,w,scale,showbrowserchrome) configurations in a YAML file; but shot-scraper does work in GitHub Actions.
Some web testing tools can record a video of a test session and save it if there's a test failure.
E.g. Playwright defaults to an 800x600 viewport for test videos to retain-on-failure or record only if on-first-retry: https://playwright.dev/docs/videos
Something like Cloudflare Browser Isolation - which splits the browser at an interface such that a Chrome browser server runs on a remote server and a Chrome client runs locally - might make it easier to compress recordings of n x test invocations (in isolated browsers or workers)
Use case: add which few of these to DevTools. IDK if there's a YAML parser in DevTools already, otherwise JSON + jq should work somehow
awesome-chrome-devtools: https://github.com/paulirish/awesome-chrome-devtools