Unless you're referring to something else, the official [Alpine PostGIS docker image is 151MB](https://hub.docker.com/layers/postgis/postgis/9.5-2.5-alpine/imag

Unless you're referring to something else, the official [Alpine PostGIS docker image is 151MB](https://hub.docker.com/layers/postgis/postgis/9.5-2.5-alpine/images/sha256-d02f60373f803dd58b0e6460be7c54f482c8088664808ba7ea168da0e6167be9?context=explore https://hub.docker.com/layers/postgis/postgis/9.5-2.5-alpine...), and you can find minimal images around 35MB. These images contain geometry engine binaries like GEOS, which you will likely need if you want to perform operations other than `distance` at decent speeds.