etcd: publish etcd v3.6.0 image

Signed-off-by: joshjms <[email protected]>

Author: joshjms

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

@@ -27,6 +27,7 @@
     "sha256:51eae8381dcb1078289fa7b4f3df2630cdc18d09fb56f8e56b41c40e191d6c83": ["3.5.7-0"]
     "sha256:b3a0da984f9af598234c018faa4f28dd6a6461f5719163a61f10ebf26dbca1e9": ["3.5.8-0"]
     "sha256:e013d0d5e4e25d00c61a7ff839927a1f36479678f11e49502b53a5e0b14f10c3": ["3.5.9-0"]
+    "sha256:50dd70d8ce19d9fa1688408fecc34186b6c100dd477e4ace8913fe829c5e5907": ["3.6.0-0"]
     "sha256:87cd0c2afe02de8dca78b8027852a6e8a18752ad5036be71ff21dea8c175abb9": ["3.6.0-alpha.0-0"]
     "sha256:5b19cb5c3eeb06dbbea9d167faef0694d59f513b3d4797801787f95f2742a605": ["3.6.0-rc.1-0"]
     "sha256:0f59a43c4278255aae07b3e97506d3880aff23c6da7e37e117b4b12651e048ad": ["3.6.0-rc.4-0"]