CEL Interceptor: Filtering and Modifying Event Payloads with Tekton Triggers

CEL stands for Common Expression Language. It is an open-source expression language that allows you to evaluate expressions and perform calculations in a variety of contexts. In the context of Tekton Triggers, CEL is used as a language to filter and modify the payloads of incoming events. The CEL Interceptor allows you to apply CEL expressions to incoming events and manipulate the event payload by adding or modifying fields.