ci: skip release-please job when secret is not defined #288

Job	Run time
list-descriptions	7s
build (Basic.OpenApi.V2.json)	25s
build (Basic.OpenApi.json)	34s
build (Basic.OpenApi.V2.yaml)	34s
build (Empty.OpenApi.json)	38s
build (Basic.OpenApi.V3.1.json)	28s
build (Empty.OpenApi.V3.1.yaml)	22s
build (Basic.OpenApi.V3.1.yaml)	25s
build (Basic.OpenApi.yaml)	24s
build (Empty.OpenApi.V2.yaml)	26s
build (Empty.OpenApi.yaml)	25s
build (Empty.OpenApi.V3.1.json)	40s
build (TripService.OpenApi.V2.json)	26s
build (Multiple.Schema.OpenApi.V2.yaml)	26s
build (Multiple.Schema.OpenApi.json)	28s
build (Empty.OpenApi.V2.json)	31s
build (Multiple.Schema.OpenApi.V3.1.json)	34s
build (TripService.OpenApi.V2.yaml)	25s
build (Multiple.Schema.OpenApi.V2.json)	23s
build (Multiple.Schema.OpenApi.V3.1.yaml)	25s
build (TripService.OpenApi.json)	36s
build (TripService.OpenApi.V3.1.yaml)	27s
build (TripService.OpenApi.yaml)	32s
build (TripService.OpenApi.V3.1.json)	32s
build (Multiple.Schema.OpenApi.yaml)	23s
	11m 36s

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