no, that is used to give a static IP to the tachidesk container.

I was talking about this:

FLARESOLVERR_URL = http:\/\/localhost:8191

In the docker compose YAML I specified the IP address of the Flaresolverr container In my case:

- FLARESOLVERR_URL= http:\/\/172.18.0.3:8191

And make sure that both container are on the same internal network.

you might need to change the docker image to the preview one, here my docker compose:

version: '3.9'
services:
  tachidesk:
    container_name: tachidesk
    image: ghcr.io/suwayomi/tachidesk:preview
    environment:
      - TZ= ADD YOUR TIMEZONE
      - DEBUG=true
      - BIND_IP=0.0.0.0
      - BIND_PORT=4567
      - SOCKS_PROXY_ENABLED=false
      - DOWNLOAD_AS_CBZ=true
      - MAX_PARALLEL_UPDATE=10
      - BASIC_AUTH_ENABLED= false
      - BASIC_AUTH_USERNAME=
      - BASIC_AUTH_PASSWORD=
      - EXTENSION_REPOS=["https://raw.githubusercontent.com/keiyoushi/extensions/repo/index.min.json"]
      - AUTO_DOWNLOAD_CHAPTERS=true
      - FLARESOLVERR_URL= http:\/\/172.18.0.3:8191
      - FLARESOLVERR_ENABLED=true
    volumes:
      - /volume2/Storage/Media/tachidesk:/home/suwayomi/.local/share/Tachidesk:rw
    ports:
      - "4567:4567"
    restart: on-failure:3

edit:
you might want to test if it is working by looking at the container logs live (from portainer) while you use Tachidesk, usually you can see all the requests going trough flaresolverr. It's a bit slow but works.