✨ [Docker] Migrated from rockylinux:8 to rockylinux:8-minimal base image

[Coduz]

This PR changes the base image used to build our java-base image for Docker containers

Main scope of this change is to shrink our image footprint

Container	Size Rockylinux 8	Size Rockylinux 8-minimal
kapua/java-base	850 MB	640MB
kapua/jetty-base	899 MB	689 MB
kapua/kapua-sql	855 MB	645 MB
kapua/kapua-events-broker	1.11 GB	897 MB
kapua/kapua-api	1.17 GB	955 MB
kapua/kapua-job-engine	1.13 GB	922 MB
kapua/kapua-broker-artemis	1.2 GB	992 MB
kapua/kapua-service-authentication	976 MB	766 MB
kapua/kapua-consumer-lifecycle	990 MB	780 MB
kapua/kapua-consumer-telemetry	981 MB	771 MB

The java-base image shrinks of 210 MB, which are saved for each of the Docker container that are using it (all of them).

Moving to 8-minimal also decreases the number of vulnerabilities for our Docker images.

Related Issue
None

Description of the solution adopted

• Changed the base image from rockylinux:8 to rockylinux:8-minimal
• Updated yum commands to microdnf
• Installed required packages no longer in the base image
  • tar
  • gzip
  • shadow-utils

Screenshots
None

Any side note on the changes made
None