webfinger

Github

Explanation: webfinger.net

docker-compose

version: "3"
services:
  webfinger:
    image: archef2000/webfinger:latest
    container_name: webfinger
    ports:
      - 8080:8080/tcp
    environment:
      - PORT=8080
      - LINKS_1_REL=http://openid.net/specs/connect/1.0/issuer
      - LINKS_1_HREF=${issuer URL}
      - LINKS_2_REL=${rel URL}
      - LINKS_2_HREF=${issuer URL}
    restart: unless-stopped