[Bug] dpkg error installing zenohd in Docker

[JEnoch]

Describe the bug

Installation of zenohd debian package in a fresh ubuntu:latest container returns the folliwing error:

/var/lib/dpkg/info/zenohd.postinst: 23: sudo: not found
dpkg: error processing package zenohd (--configure):
 installed zenohd package post-installation script subprocess returned error exit status 127
Errors were encountered while processing:
 zenohd
E: Sub-process /usr/bin/dpkg returned an error code (1)

To reproduce

1. docker run -it --init ubuntu
2. apt update && apt install -y ca-certificates
3. echo "deb [trusted=yes] https://download.eclipse.org/zenoh/debian-repo/ /" | tee -a /etc/apt/sources.list > /dev/null
4. apt update && apt install -y zenohd

System info

• Docker ubuntu:latest
• Zenoh 0.7.0-rc

[JEnoch]

sudo and systemctl are not present in Docker image, making the postinstall script to fail.
It should check this and display a warning instead of failing.