Add spring boot integration test

[Sgitario]

Added an initial CI job to verify the steps to test the spring boot sample.
Note that there are many hardcoded values that need to be fixed in separate tests:

• The scripts to create the webhooks have the K8s namespace "test" hardcoded.
• The dnsNames of the spring-boot-sample contain hardcoded the K8s namespace "test". This issue will be fixed in the next version of Dekorate.
  In future iterations, we should ease this workflow by generating the webhooks manifests for example.

[Sgitario]

@csviri I only added the integration test for PR builds. Do you want it to add it into other workflows like "master-snapshot-release.yml", the "test" job?

[csviri]

@csviri I only added the integration test for PR builds. Do you want it to add it into other workflows like "master-snapshot-release.yml", the "test" job?

good, question, since they not running long, not really consuming too much resources, we might now.

[Sgitario]

@csviri I only added the integration test for PR builds. Do you want it to add it into other workflows like "master-snapshot-release.yml", the "test" job?

good, question, since they not running long, not really consuming too much resources, we might now.

Added spring boot IT as part of the release workflow @csviri

[csviri]

LGTM

[csviri]

thank you @Sgitario !