Deployment pipelines are automaticaly triggered by changes to branches in the application's GitHub repository.
To view the pipelines, log into your AWS user account and ensure you have switched to a role that provides the reqired permissions.
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From the 'Services' dropdown (top left), select 'CodePipeline'
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Select the pipeline for the relevent service / environment
Sometimes a pipeline may fail on the 'Build Phase' due to a flakey test which requires it to be ran again.
This can be done by clicking 'Release Change' when viewing a pipeline