Include only sync github workflow on the main branch

[harshad16]

Include only sync github workflow on the main branch

[openshift-ci]

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[openshift-ci]

@harshad16: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/images	b185f59	link	true	/test images

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