Add otel agent
- enhance the Dockerfile to configure the opentelemetry java agent
- the otel agent can be configured via environment variables [1][2]
[1] [Environment Variable Specification](https://opentelemetry.io/docs/specs/otel/configuration/sdk-environment-variables/)
[2] [Exporter Environment Variables](https://opentelemetry.io/docs/specs/otel/protocol/exporter/#configuration-options)
Issue-ID: SO-4236
Change-Id: I53bbfe10dc5f13ac4b466faad41f9f8c91646035
Signed-off-by: Fiete Ostkamp <fiete.ostkamp@telekom.de>