Add GHCR image publishing to K3s release #2920

Job	Run time
build / Build	7m 30s
Build Go Tests (arm64)	3m 10s
Build Go Tests (amd64)	1m 45s
build-arm64 / Build	6m 25s
E2E Tests (embeddedmirror)	6m 28s
E2E Tests (rootless)	4m 47s
E2E Tests (s3)	9m 42s
E2E Tests (wasm)	5m 14s
E2E Tests (externalip)	4m 46s
E2E Tests (btrfs)	4m 45s
E2E Tests (startup)	15m 37s
E2E Tests (privateregistry)	6m 15s
Docker (basics, arm64)	1m 34s
Docker (basics, amd64)	1m 21s
Docker (lazypull, arm64)	1m 27s
Docker (autoimport, amd64)	2m 13s
Docker (hardened, amd64)	1m 56s
Docker (cacerts, arm64)	1m 18s
Docker (etcd, amd64)	2m 49s
Docker (bootstraptoken, arm64)	1m 15s
Docker (hardened, arm64)	2m 52s
Docker (svcpoliciesandfirewall, amd64)	2m 5s
Docker (cacerts, amd64)	56s
Docker (etcd, arm64)	2m 38s
Docker (snapshotrestore, amd64)	6m 10s
Docker (token, arm64)	5m 24s
Docker (upgrade, arm64)	1m 48s
Docker (upgrade, amd64)	1m 7s
Docker (skew, amd64)	2m 0s
Docker (skew, arm64)	2m 45s
Docker (lazypull, amd64)	1m 19s
Docker (token, amd64)	4m 39s
Docker (secretsencryption, amd64)	8m 53s
Docker (bootstraptoken, amd64)	1m 4s
	2h 13m 57s

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