cmd/osbuild-worker-executor: add oaas as worker executor #16507

Job	Run time
🧹 cloud-cleaner-is-enabled	2s
🗄 DB tests	1m 39s
🔍 Check for missing or unused runner repos	13s
🔍 Check for valid snapshot urls	48s
Gitlab CI trigger helper	2s
⌨ Golang Lint	2m 56s
🎀 kube-linter	16s
📦 Packit config lint	1m 6s
🔍 Check source preparation	1m 8s
🐍 Lint python scripts	24s
📦 RPMlint	42s
🐚 Shellcheck	24s
🛃 Unit tests	3m 18s
	12m 58s

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