Finish talk-recording geckodriver install or use chromium

[szaimen]

Things that should be done after https://github.com/nextcloud/all-in-one/pull/2645 is finished

• needs https://github.com/nextcloud/all-in-one/issues/3570
• [x] ~~test if using the internal signaling IP also works~~ does not work
• [x] ~~try if chromium works after https://github.com/nextcloud/spreed/pull/9174. If not, see below (should be available with 28)~~ not recommended

geckodriver:

• [x] wait for https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/56841 being merged
  • [x] then change the apk add repository edge/testing to apk add repository edge/community https://github.com/nextcloud/all-in-one/pull/3907
• [ ] wait for alpine v3.xx.1 docker image release (maybe v3.20.1?)
  • [ ] update talk image to v3.xx.1
  • [ ] then move geckodriver to normal apk add line and remove apk add repository edge/community line