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Add deprecation note to `github` node in .gitpod.yml – EXP-682 #17563

Job	Run time
create-runner / Create GCE VM	1m 10s
Configure job parameters	3s
Build previewctl	34s
Build Gitpod	50s
infrastructure	21s
Run workspace integration tests on main branch	0s
install-app	0s
Install Gitpod	0s
Install Monitoring Satellite	0s
Run integration test	0s
delete-runner / Delete ephemeral GCE VM	30s
	3m 28s

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