Optimize rockcraft build #40

Job	Run time
Build Rocks and Push Arch Specific Images / Get rocks	6s
Build Rocks and Push Arch Specific Images / Build rock (coredns, 1.11.1, ./, amd64, ghcr.io/canonical/coredns:cc2967868ca1be52fdb76a10d00c923...	4m 3s
Build Rocks and Push Arch Specific Images / Build rock (coredns, 1.11.1, ./, arm64, ghcr.io/canonical/coredns:cc2967868ca1be52fdb76a10d00c923...	4m 12s
run-tests / Run tests	54s
Combine Rocks and Push Multiarch Manifest / Create Mulitarch Manifest	9s
scan-images / Scan image (ghcr.io/canonical/coredns:cc2967868ca1be52fdb76a10d00c923ecd559810b6778de234dec9582aa...	18s
scan-images / Scan image (ghcr.io/canonical/coredns:cc2967868ca1be52fdb76a10d00c923ecd559810b6778de234dec9582aa...	28s
	10m 10s

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