[request] Point to a secret key file instead of writing it in docker-compose.yml

[zilexa]

Currently the secret key itself needs to be given in an environmental variable.
Please allow the ability to link to a file instead, which should contain the secret key.

something like:

volumes: 
  - home/user/docker/firefox/secret:data/secret

[crazy-max]

Already available: https://github.com/crazy-max/docker-firefox-syncserver/blob/master/entrypoint.sh#L54

[zilexa]

Oh that's great thank you!!

[zilexa]

Pardon me for asking this, as I am already grateful for the image you have created.
I couldn't find more details in the documentation from Mozilla and as I am not a pro yet with Docker, one last question:
Can I just use .txt file extension or no extension at all? This is how I have set it up now:

    environment: 
      - PUID=${PUID}
      - PGID=${PGID}
      - TZ=${TZ}
      - FF_SYNCSERVER_PUBLIC_URL=https://firefox.mydomain.com
      - FF_SYNCSERVER_FORWARDED_ALLOW_IPS=*
      - FF_SYNCSERVER_SECRET_FILE=/data/secret/secret.txt
    volumes:
      - "${USERDIR}/docker/firefox-syncserver:/data"

and on the host the secret is in:
${USERDIR}/docker/firefox-syncserver/secret/secret.txt