This repository targets Postgres 10 with PostGIS 2.5. The docker image is published on docker hub as existentialmutt/postgis:10-2.5
To build for amd64 (Intel processors) and arm64 (Apple Silicon) run
docker buildx build --platform=linux/amd64,linux/arm64 -t existentialmutt/postgis:10-2.5 . --push
Based on the official PostGIS Docker images. See the official repo for more information.