FAST - trigger GitHub workflow also on PR synchronize event (#702)
FAST - trigger GitHub workflow also on PR synchronize event (#702)

Add synchronize to the pull_request trigger so that the workflow is also run when the source branch is updated.
GoogleCloudPlatform/cloud-foundation-fabric,GoogleCloudPlatform/cloud-foundation-fabric,GoogleCloudPlatform/cloud-foundation-fabric,GoogleCloudPlatform/cloud-foundation-fabric