config/jobs: k8s-infra-apps jobs report to slack

[spiffxp]

Part of kubernetes/k8s.io#2151

For lack of a better channel, use #k8s-infra-alerts

Copied the reporter_config from post-test-infra-deploy-prow, then
tweaked a bit for formatting

Renamed the testgrid tabs from post-k8sio-deploy-app-{app} to
deploy-{app}

[spiffxp]

/cc @ameukam @dims

[dims]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, spiffxp

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• config/jobs/kubernetes/wg-k8s-infra/trusted/OWNERS [dims,spiffxp]

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[k8s-ci-robot]

@spiffxp: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key wg-k8s-infra-apps.yaml using file config/jobs/kubernetes/wg-k8s-infra/trusted/wg-k8s-infra-apps.yaml

In response to this:

Part of kubernetes/k8s.io#2151

For lack of a better channel, use #k8s-infra-alerts

Copied the reporter_config from post-test-infra-deploy-prow, then
tweaked a bit for formatting

Renamed the testgrid tabs from post-k8sio-deploy-app-{app} to
deploy-{app}

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