Add apisnoop conformance gate

Co-authored-by: hh <hh@ii.coop>

change alert email to newly-made mailing list

config/jobs/kubernetes/sig-arch/OWNERS

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+# See the OWNERS docs at https://go.k8s.io/owners
+
+# This is the owner of the test code.  The test data itself is owned by sig-architecture.
+reviewers:
+  - cheftako
+  - oomichi
+  - johnbelamaric
+  - bobymcbobs
+approvers:
+  - cheftako
+  - spiffxp
+  - johnbelamaric
+  - hh
+labels:
+  - area/conformance
+  - sig/architecture

config/jobs/kubernetes/sig-arch/conformance-gate.yaml

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+periodics:
+- interval: 3h
+  name: apisnoop-conformance-gate
+  annotations:
+    testgrid-dashboards: sig-arch-conformance
+    testgrid-tab-name: apisnoop-conformance-gate
+    test-grid-alert-email: kubernetes-sig-arch-conformance-test-failures@googlegroups.com
+    testgrid-num-failures-to-alert: '1'
+    description: 'Uses APISnoop to check that new GA endpoints are conformance tested in latest e2e test run'
+  decorate: true
+  spec:
+    containers:
+    - name: apisnoop-gate
+      image: gcr.io/k8s-staging-apisnoop/snoopdb:v20200923-v2020.09.23-1-gb3afc41
+      args:
+      - postgres

config/testgrids/kubernetes/sig-arch/OWNERS

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+# See the OWNERS docs at https://go.k8s.io/owners
+
+# This is the owner of the test code.  The test data itself is owned by sig-architecture.
+reviewers:
+  - cheftako
+  - oomichi
+  - johnbelamaric
+  - bobymcbobs
+approvers:
+  - cheftako
+  - spiffxp
+  - johnbelamaric
+  - hh
+labels:
+  - area/conformance
+  - sig/architecture

config/testgrids/kubernetes/sig-arch/config.yaml

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+# Dashboard Group
+#
+dashboard_groups:
+- name: sig-arch
+  dashboard_names:
+  - sig-arch-conformance
+
+# Dashboards
+#
+dashboards:
+- name: sig-arch-conformance