refactor: Introduce build aggregator #304

Job	Run time
Detect relevant changed files	6s
Run cargo-udeps	2m 14s
Build/Publish arm64 Image	7m 3s
Build/Publish amd64 Image	7m 26s
Package/Publish 0.0.0-pr841 Helm Chart	45s
Publish/Sign 0.0.0-pr841 Index	38s
Run OpenShift Preflight Check for 0.0.0-pr841-amd64	33s
Run OpenShift Preflight Check for 0.0.0-pr841-arm64	26s
Generate Provenance for 0.0.0-pr841 (oci.stackable.tech) / detect-env	5s
Generate Provenance for 0.0.0-pr841 (quay.io) / detect-env	4s
Generate Provenance for 0.0.0-pr841 (quay.io) / generator	26s
Generate Provenance for 0.0.0-pr841 (oci.stackable.tech) / generator	34s
Finished Build and Publish	3s
Generate Provenance for 0.0.0-pr841 (quay.io) / final	4s
Generate Provenance for 0.0.0-pr841 (oci.stackable.tech) / final	2s
Failure Notification	0s
	20m 29s

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