Koji: expose image metadata in build extra metadata, including boot mode #14318

Job	Run time
🧹 cloud-cleaner-is-enabled	2s
🗄 DB tests	1m 6s
Gitlab CI trigger helper	3s
🎀 kube-linter	20s
⌨ Lint	47s
🔍 Check source preparation	1m 20s
🐍 Lint (dnf-json)	1m 44s
📦 RPMlint	1m 38s
🐚 Shellcheck	33s
🔍 Check for valid snapshot urls	49s
🛃 Unit tests	6m 29s
	14m 51s

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