support extraLabels for vault-agent-injector (#428)

* support extraLabels for vault-agent-injector

* added unit test for extraLabels

* fix test

* added injector.extraLabels as empty map to values file

templates/injector-deployment.yaml

@@ -23,6 +23,9 @@ spec:
         app.kubernetes.io/name: {{ template "vault.name" . }}-agent-injector
         app.kubernetes.io/instance: {{ .Release.Name }}
         component: webhook
+        {{- if  .Values.injector.extraLabels -}}
+          {{- toYaml .Values.injector.extraLabels | nindent 8 -}}
+        {{- end -}}
       {{ template "injector.annotations" . }}
     spec:
       {{ template "injector.affinity" . }}

test/unit/injector-deployment.bats

@@ -531,3 +531,15 @@ load _helpers
       yq '.spec.template.spec.securityContext.runAsGroup | length > 0' | tee /dev/stderr)
   [ "${actual}" = "false" ]
 }
+#--------------------------------------------------------------------
+# extra labels
+
+@test "injector/deployment: specify extraLabels" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      --show-only templates/injector-deployment.yaml \
+      --set 'injector.extraLabels.foo=bar' \
+      . | tee /dev/stderr |
+      yq -r '.spec.template.metadata.labels.foo' | tee /dev/stderr)
+  [ "${actual}" = "bar" ]
+}

values.yaml

@@ -134,6 +134,10 @@ injector:
   # of the annotations to apply to the injector pods
   annotations: {}
 
+  # Extra labels to attach to the agent-injector
+  # This should be a YAML map of the labels to apply to the injector
+  extraLabels: {}
+
   # Injector service specific config
   service:
     # Extra annotations to attach to the injector service