feat(watcher): Add rudimentary notification tooling

The `watcher` Go application uses the Kubernetes client API
to monitor jobs in the current namespace and send notifications
for major lifecycle events.

Jobs need to be annotated in order to be eligible for notifications:

Use`x-jobby.io/notify-channel: [slack|webhook]` to determine the
notification channel (HTTP webhook or Slack), and then control the
destinations with `x-jobby.io/slack-channel-ids` (comma-separated)
or `x-jobby.io/webhook-urls` (comma-separated) annotations.

If using the Slack notification channel, pass the Slack API token through
the `WATCHER_SLACK_API_TOKEN` env variable.

Author: AdrianoKF

watcher/.gitignore

@@ -0,0 +1,2 @@
+# Binary output
+watcher

watcher/.ko.yaml

@@ -0,0 +1,2 @@
+defaultPlatforms:
+  - linux/arm64

watcher/go.mod

@@ -0,0 +1,58 @@
+module watcher
+
+go 1.22.5
+
+require (
+	github.com/nikoksr/notify v0.41.0
+	github.com/sirupsen/logrus v1.9.3
+	k8s.io/api v0.30.2
+	k8s.io/apimachinery v0.30.2
+	k8s.io/client-go v0.30.2
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/emicklei/go-restful/v3 v3.11.0 // indirect
+	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-openapi/jsonpointer v0.19.6 // indirect
+	github.com/go-openapi/jsonreference v0.20.2 // indirect
+	github.com/go-openapi/swag v0.22.3 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/gnostic-models v0.6.8 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
+	github.com/imdario/mergo v0.3.6 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/slack-go/slack v0.12.2 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/stretchr/objx v0.5.0 // indirect
+	github.com/stretchr/testify v1.8.4 // indirect
+	golang.org/x/net v0.23.0 // indirect
+	golang.org/x/oauth2 v0.10.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/term v0.18.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/klog/v2 v2.120.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340 // indirect
+	k8s.io/utils v0.0.0-20230726121419-3b25d923346b // indirect
+	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect
+	sigs.k8s.io/yaml v1.3.0 // indirect
+)

watcher/go.sum

@@ -0,0 +1,174 @@
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+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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watcher/k8s/job.yaml

@@ -0,0 +1,12 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: watcher
+spec:
+  ttlSecondsAfterFinished: 120
+  template:
+    spec:
+      containers:
+        - name: watcher
+          image: ko-watcher
+      restartPolicy: OnFailure

watcher/k8s/rbac.yaml

@@ -0,0 +1,12 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: test-foo
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: view
+subjects:
+  - kind: ServiceAccount
+    name: default
+    namespace: default