Add .tekton/events/ folder and relates trigger yaml file

[bairixie]

As a developer I need an EventListener set up with a Trigger, TriggerBinding, and TriggerTemplate So that I can automatically initiate PipelineRuns in response to specific events, improving the automation and efficiency of our deployment processes.

Details and Assumptions

• event_listener.yaml
• trigger.yaml
• trigger_binding.yaml

• trigger_template.yaml

  Acceptance Criteria

  Given the repository is set up with the necessary .tekton configuration files
  When a developer pushes code to the main branch
  Then  the EventListener triggers a new PipelineRun using the specified pipeline and parameters extracted from the event