Promote NFD v0.15.6

Signed-off-by: Carlos Eduardo Arango Gutierrez <[email protected]>

Author: ArangoGutierrez

registry.k8s.io/images/k8s-staging-nfd/images.yaml

@@ -75,6 +75,8 @@
     "sha256:d3f25344bfd95012108a7b71bd88a1f014d97871305fa4628aa0b7df779cd0bc": ["v0.15.4-full"]
     "sha256:b069bbc8bd4169817410d00858e74efd2334ebe365e27ced8e31fd12b7e69e59": ["v0.15.5","v0.15.5-minimal"]
     "sha256:21d59834522c52fd55865ca370b31444dc7d8d7c4614eefe9da54155495f5ca8": ["v0.15.5-full"]
+    "sha256:b62e08811917a06c3246b32700ef59dd0b0d0d2d3fdc596bdaf4c7383704720d": ["v0.15.6","v0.15.6-minimal"]
+    "sha256:9b5829dc7e4de376bcb14f6cd19a242d9813138e2b9dcffbb7891c47fdfb009a": ["v0.15.6-full"]
     "sha256:fb3b6815b74fd31379697cb73ad684d521c58b0c5c22ac2d6b25132922c0232f": ["v0.16.0","v0.16.0-minimal"]
     "sha256:5aa9c8fb4983dc341536231ec6a261737f7b392c08266ee1891194a2912b4ff1": ["v0.16.0-full"]
     "sha256:4eda8fc5224c9112cb19e58702724e39c8237a752d336e5bca69c1bc3f0aaa4b": ["v0.16.1","v0.16.1-minimal"]