Edward Nys

Add config volume and healthcheck

1

We are using this dockerfile for internal usage. This pr adds a Healthcheck and changes the position of config files.

Impact of LetsEncrypt certificate expiry

5

**Logstash information**: Please include the following information: 1. Logstash version (e.g. `bin/logstash --version`) 2. Logstash installation source (e.g. built from source, with a package manager: DEB/RPM, expanded from tar or...