Adding `rad credential register aws` command changes in the workflow … #1404

Job	Run time
Build and push sample images to GHCR (samples/demo/, samples/demo)	1m 37s
Build and push sample images to GHCR (samples/dapr/ui/, samples/dapr-frontend)	35s
Build and push sample images to GHCR (samples/dapr/nodeapp/, samples/dapr-backend)	12s
Build and push sample images to GHCR (samples/aws/, samples/aws)	31s
Build and push sample images to GHCR (samples/aws-sqs/, samples/aws-sqs)	31s
Build and push sample images to GHCR (samples/volumes/, samples/volumes)	19s
	3m 45s

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