cmd/osbuild-service-maintenance: respect dry run #17337

Job	Run time
⌨ Golang Lint	3m 42s
🗄 DB tests	1m 15s
📦 Packit config lint	1m 0s
🔍 Check for valid snapshot urls	18s
🔍 Check source preparation	1m 7s
🐍 Lint python scripts	31s
🛃 Unit tests	4m 17s
🔍 Check for missing or unused runner repos	13s
🧹 cloud-cleaner-is-enabled	1s
Gitlab CI trigger helper	3s
🎀 kube-linter	15s
📦 RPMlint	47s
🐚 Shellcheck	25s
	13m 54s

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