To generate openapi.yaml file run service (spring-boot:run) and go to
http://localhost:<service-port>/v3/api-docs.

Added dummy facade, which for now just creates DTO objects, but later
will be used to map DB data to DTOs.

Spring of version 6.0+ requires Java version 17+.

In addition I have changed all versions from snapshot to '1.0.0'. I am
not completely sure, but I read somewhere that the 'snapshot' version
are in some way special and require extra configuration for plugins.

core-pom: remove data jpa dependency

I left it commented out because I presume we will be using it when the
DBs will come.

Run for every push

Note: Had to add tag "shared-fi" in order to gain higher priority in
pipeline queue.

The main service is hockey-manager-service, and discussion-forum-service
is an example of helper service.

If you have any suggestions or comments on naming conventions, feel free
to adress them.

---v2
Fix naming to follow naming conventions