- Create directory /run/secrets/coturn just when it is necessary to generate a new secret file for COTURN_SHARED_SECRET_KEY. (Docker daemon should generate it anyways while running
- Use `tr -dc '[:alnum:]' </dev/urandom` instead of `tr -dc A-Za-z0-9 </dev/urandom` to generate alphanumeric COTURN_SHARED_SECRET_KEY
- Define possible empty variables at the beginning of the entrypoint.
- Fail script on any error with `set -o errexit -o errtrace -o pipefail -o nounset`
- More meaningfull message while waiting Kibana service
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