Separated workflow for main and other branches
1. From now on, the workflow defined in "pr_cluster_workflow.yaml" will be triggered on config.yaml changes. This can be used for PR testing.
2. Draft PRs are created when the source branch has logical modifications. Normal PRs are used for cluster management.
3.In the case of Draft PRs, which are for logical modifications, if a cluster is required, then the name of the cluster should adhere to the following convention "turnk8s-<PR_NUMBER>".
4. In the case of normal PRs, which are for cluster management, no cluster should be present in the config.yaml file matching the following cluster name regex turnk8s-.*
