[Feature request]: Enable using docker secrets

[crunchiersa]

I'm in the process of replacing all sensitive data in my .env-files using docker secrets. Using docker secrets does not seem to work with your container unfortunately.
My current docker-compose.yaml:

services:
  opengist:
    image: ghcr.io/thomiceli/opengist:1
    container_name: opengist
    restart: unless-stopped
    ports:
      - 127.0.0.1:6157:6157 # HTTP port
      - 10.10.120.5:2222:2222 #SSH port, can be removed if you don't use SSH
    volumes:
      - /path/to/gist:/opengist
    environment:
      - UID=1500
      - GID=120
      # I tried the following variants (only using one variant per attempt... ;)) 
      - OG_OIDC_CLIENT_KEY=${OG_OIDC_CLIENT_KEY} <--- works - if OG_OIDC_CLIENT_KEY is defined in .env
      - OG_OIDC_CLIENT_KEY_FILE=/run/secrest/gist_oidc-client <--- does not work
      - OG_OIDC_CLIENT_KEY=file:///run/secrets/gist_oidc-client <--- does not work
      - OG_OIDC_SECRET=${OG_OIDC_SECRET} <--- works - if OG_OIDC_SECRET is defined in .env
      - OG_OIDC_SECRET_FILE=/run/secrest/gist_oidc-secret <--- does not work
      - OG_OIDC_SECRET=file:///run/secrets/gist_oidc-secret <--- does not work
      - OG_OIDC_DISCOVERY_URL=${OG_OIDC_DISCOVERY_URL}
    secrets:
      - gist_oidc-client
      - gist_oidc-secret
    networks:
      - proxy_frontend
networks:
  proxy_frontend:
    external: true
secrets:
  gist_oidc-client:
    file: /path/to/secrets/gist/gist_oidc-client
  gist_oidc-secret:
    file: /path/to/secrets/gist/gist_oidc-secret`

I want to replace the OG_OIDC_CLIENT_KEY and OG_OIDC_SECRET with secrets. I have defined the secrets, attached them to the container - however using OG_OIDC_CLIENT_KEY_FILE/OG_OIDC_SECRET_FILE instead of the above environmental variables does not work - neither does defining the existing variables as "file:///run/secrets/gist_oidc-client". 

Could you add a feature to read the OIDC-Client-Key/Secret from a file?