Add SECURITY.md and CODEOWNERS #52

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
scan-images / Scan image (ghcr.io/canonical/coredns:aa58dfb8a3c702f667ed43c43327d8cd5594c8f38208738279725aef845...	24s
run-tests / Run tests	59s
scan-images / Scan image (ghcr.io/canonical/coredns:aa58dfb8a3c702f667ed43c43327d8cd5594c8f38208738279725aef845...	27s
scan-images / Scan image (ghcr.io/canonical/coredns:4c5fafc892efbaaf6dd08ca768ee3e4911d42aec6e458ba260e2220d197...	29s
scan-images / Scan image (ghcr.io/canonical/coredns:4c5fafc892efbaaf6dd08ca768ee3e4911d42aec6e458ba260e2220d197...	22s
	2m 47s

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