nginx-proxyでwordpressのアクセスができない(docker-compose.yml　version3)

前提・実現したいこと

Docker on kusanagiを利用したwordpressの2020.7段階の最新環境を作成したいです。
kagoyaのHPを見て作成できましたが、バージョンが古かったため、アップデートをしようと思いました。

###試したこと
以下のイメージをdocker pull
primestrategy/kusanagi-php
primestrategy/kusanagi-nginx
mariadb

その後、docker-component.ymlをv2→v3.8へ修正して(volumes_fromが使えなくなっているので、トップレベルvolumesに置き換え）、docker-component up -dを実行までできましたが、HPを確認しようとするとエラーがでます。

###google chromeでのアクセス時のエラー
このサイトにアクセスできません<ドメイン名> のサーバーの IP アドレスが見つかりませんでした。

うまくSSLの認証がうまくいってないようです。

curl 実行時のエラー

curl https://<ホスト名>.<ドメイン名> を実行すると以下のようなメッセージが発生します。
curl: (60) SSL certificate problem: self signed certificate
More details here: https://curl.haxx.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

どこを調べて問題を切り分けていったらよいのか見当がつかず悩んでおります。

編集前、編集後

元々のkusanagiのdocker-compose.yml(アクセス可能なことを確認済）

version: '2'

services:
  kusanagi-data:
    image: busybox
    restart: always
    stdin_open: true
    tty: true
    volumes:
      - /var/lib/mysql
      - /etc/nginx/conf.d
      - /etc/httpd/conf.d
      - /etc/kusanagi.d
      - ./data:/home/kusanagi
      - ./uploads.ini:/usr/local/etc/php/conf.d/uploads.ini
    command: /bin/sh

  kusanagi-nginx:
    image: primestrategy/kusanagi-nginx:1.10.0-1
    environment:
      VIRTUAL_HOST: www.xxxxxxxx.com
      VIRTUAL_PORT: 443
      VIRTUAL_PROTO: https
      LETSENCRYPT_HOST: www.xxxxxxxx.com
      LETSENCRYPT_EMAIL: xxxxxxxx@xxx.com
      LETSENCRYPT_TEST: "false"
      PROFILE: xxxxxxxx
      FQDN: www.xxxxxxxx.com
      WPLANG: ja
      BCACHE: "on"
      FCACHE: "on"
    volumes_from:
      - kusanagi-data
    links:
      - kusanagi-php7:php
      - kusanagi-mariadb:mysql
    ports:
      - "443"
    restart: always
    networks:
      - common_link

  kusanagi-mariadb:
    image: mariadb:10.1.21
    environment:
      MYSQL_ROOT_PASSWORD: xxxxxxxx
      MYSQL_USER: xxxx
      MYSQL_PASSWORD: xxxxxxxx
      MYSQL_DATABASE: xxxxxxxx
    volumes_from:
      - kusanagi-data
    restart: always
    networks:
      - common_link

  kusanagi-php7:
    image: primestrategy/kusanagi-php7:7.0.6-1
    links:
      - kusanagi-mariadb:mysql
    volumes_from:
      - kusanagi-data
    restart: always
    networks:
      - common_link

networks:
  common_link:
    external: true

####変更後(version3.8)

version: '3.8'

services:

  kusanagi-nginx:
    image: primestrategy/kusanagi-nginx:latest
    environment:
      VIRTUAL_HOST: www.xxxxxxxx.com
      VIRTUAL_PORT: 443
      VIRTUAL_PROTO: https
      LETSENCRYPT_HOST: www.xxxxxxxx.com
      LETSENCRYPT_EMAIL: xxxxxxxx@xxx.com
      LETSENCRYPT_TEST: "false"
      PROFILE: xxxxxxxx
      FQDN: www.xxxxxxxx.com
      WPLANG: ja
      BCACHE: "on"
      FCACHE: "on"
    volumes:
      - $(pwd)/data:/home/kusanagi
      - $(pwd)/uploads.ini:/usr/local/etc/php/conf.d/uploads.ini
      - mysql:/var/lib/mysql
      - nginxconfd:/etc/nginx/conf.d
      - httpdconfd:/etc/httpd/conf.d
      - kusanagid:/etc/kusanagi.d
    links:
      - kusanagi-php7:php
      - kusanagi-mariadb:mysql
    ports:
      - "443"
    restart: always
    networks:
      - common_link

  kusanagi-mariadb:
    image: mariadb:latest
    environment:
      MYSQL_ROOT_PASSWORD: xxxxxxxx
      MYSQL_USER: xxxx
      MYSQL_PASSWORD: xxxxxxxx
      MYSQL_DATABASE: xxxxxxxx
    volumes:
      - ./data:/home/kusanagi
      - ./uploads.ini:/usr/local/etc/php/conf.d/uploads.ini
      - mysql:/var/lib/mysql
      - nginxconfd:/etc/nginx/conf.d
      - httpdconfd:/etc/httpd/conf.d
      - kusanagid:/etc/kusanagi.d
    restart: always
    networks:
      - common_link

  kusanagi-php7:
    image: primestrategy/kusanagi-php7:latest
    links:
      - kusanagi-mariadb:mysql
    volumes:
      - ./data:/home/kusanagi
      - ./uploads.ini:/usr/local/etc/php/conf.d/uploads.ini
      - mysql:/var/lib/mysql
      - nginxconfd:/etc/nginx/conf.d
      - httpdconfd:/etc/httpd/conf.d
      - kusanagid:/etc/kusanagi.d
    restart: always
    networks:
      - common_link

volumes:
  mysql:
  nginxconfd:
  httpdconfd:
  kusanagid:

networks:
  common_link:
    external: true

元々のnginx-proxyのdocker-compose.yml(アクセス可能なことを確認済）

version: '2'

services:
  nginx-proxy:
    image: jwilder/nginx-proxy
    container_name: nginx-proxy
    privileged: true
    ports:
      - 80:80
      - 443:443
    volumes:
      - ./docker-compose.d/certs:/etc/nginx/certs:ro
      - ./docker-compose.d/htpasswd:/etc/nginx/htpasswd
      - /etc/nginx/vhost.d
      - /usr/share/nginx/html
      - /var/run/docker.sock:/tmp/docker.sock:ro
      - ./nginx.conf:/etc/nginx/conf.d/my_proxy.conf
    restart: always
    networks:
      - common_link

  letsencrypt-nginx:
    image: jrcs/letsencrypt-nginx-proxy-companion
    container_name: letsencrypt-nginx
    privileged: true
    volumes:
      - ./docker-compose.d/certs:/etc/nginx/certs:rw
      - /var/run/docker.sock:/var/run/docker.sock:ro
    volumes_from:
      - nginx-proxy
    restart: always
    networks:
      - common_link
networks:
  common_link:
    external: true

変更後(version 3.8)

version: 3.8'

services:
  nginx-proxy:
    image: jwilder/nginx-proxy
    container_name: nginx-proxy
    privileged: true
    ports:
      - 80:80
      - 443:443
    volumes:
      - ./docker-compose.d/certs:/etc/nginx/certs:ro
      - ./docker-compose.d/htpasswd:/etc/nginx/htpasswd
      - vhost.d:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
      - /var/run/docker.sock:/tmp/docker.sock:ro
      - ./nginx.conf:/etc/nginx/conf.d/my_proxy.conf
    restart: always
    networks:
      - common_link

  letsencrypt-nginx:
    image: jrcs/letsencrypt-nginx-proxy-companion
    container_name: letsencrypt-nginx
    privileged: true
    volumes:
      - ./docker-compose.d/certs:/etc/nginx/certs:rw
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - vhost.d:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
    restart: always
    networks:
      - common_link

  volumes:
    vhost.d:
    html:

networks:
  common_link:
    external: true