Support being able to set securityContext (#153)

charts/telegraf/Chart.yaml

 apiVersion: v1
 name: telegraf
-version: 1.7.23
+version: 1.7.24
 appVersion: 1.14
 deprecated: false
 description: Telegraf is an agent written in Go for collecting, processing, aggregating, and writing metrics.

charts/telegraf/templates/deployment.yaml

@@ -24,6 +24,10 @@ spec:
 {{ toYaml .Values.podAnnotations | indent 8 }}
         {{- end }}
     spec:
+{{- if .Values.securityContext }}
+      securityContext:
+{{ toYaml .Values.securityContext | indent 8 }}
+{{- end }}
       serviceAccountName: {{ template "telegraf.serviceAccountName" . }}
       containers:
       - name: {{ .Chart.Name }}