Integration test for serverless module on gardener (azure)

[kwiatekus]

Description

Run serverless integration tests on gardener as part of post-merge verifications

AC

• test involves provisioning gardener instance ( kyma provision gardener az command could be used )
• test involves installing serverless module solo (via lifecycle-manager) and running integration tests
• test is executed whenever a PR is merged to main branch
• test uses latest supported kube version (STRETCH: and latest supported garden linux image)
• test cleans up gardener shoot cluster
• gardener secret is securely stored (consider prow or github action)
• serverless-manager release workflow fails if the test failed

Reasons

We are responsible for making sure serverless module works on hyperscalers. Gardener is the most used kubernetes provider among kyma/serverless adopters