[dacharyc]

There are a bunch of services that already do this in some permutation or another:

Tugboat: https://tugboat.qa/ Squash: https://www.squash.io/ Dockup: https://getdockup.com/ Release: https://www.releaseapp.io/ FeaturePeek: https://featurepeek.com/ Valist: https://www.valist.dev/

Some of them obfuscate the Docker aspect, or use different technologies (GCP, k8s), but this seems to be an area that is getting well-covered. And that doesn't consider similar functionality integrated in big platforms, like Netlify Deploy Previews, GitLab Review Apps, etc.