Container does not start when using only CLOUDFLARE_CREDENTIALS_FILE

[sdamm4z]

Description:
If the environment variable CLOUDFLARE_API_TOKEN is not set, because CLOUDFLARE_CREDENTIALS_FILE is intended to be used instead, the container fails to start.

Currently, the container must be started with a dummy variable like:
CLOUDFLARE_API_TOKEN="any text"
in order for CLOUDFLARE_CREDENTIALS_FILE to be recognized.

Expected Behavior:
The container should start and correctly use the credentials file even if CLOUDFLARE_API_TOKEN is not set.

Steps to Reproduce:

1. Do not set CLOUDFLARE_API_TOKEN
2. Mount CLOUDFLARE_CREDENTIALS_FILE correctly
3. Start the container
4. Observe failure: container exits with missing API token error