Add SECURITY.md and CODEOWNERS #14

Job	Run time
Build Rocks and Push Arch Specific Images / Get rocks	6s
Build Rocks and Push Arch Specific Images / Build rock	0s
Combine Rocks and Push Multiarch Manifest	0s
run-tests / Run tests	56s
scan-images / Scan image (ghcr.io/canonical/metrics-server:4c166d6a795626add0d5e459669ceaf950a5d15086f804a249f8...	28s
scan-images / Scan image (ghcr.io/canonical/metrics-server:4c166d6a795626add0d5e459669ceaf950a5d15086f804a249f8...	23s
scan-images / Scan image (ghcr.io/canonical/metrics-server:583e59f4d7ecb453f20b5a182859c88dd25184ffd20001c15ac4...	28s
scan-images / Scan image (ghcr.io/canonical/metrics-server:583e59f4d7ecb453f20b5a182859c88dd25184ffd20001c15ac4...	23s
	2m 44s

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