add option to set container environment variables

Author: mikaEz

proxysql/Chart.yaml

@@ -2,4 +2,4 @@
 apiVersion: v1
 name: proxysql
 description: ProxySQL Configuration
-version: 0.1.7
+version: 0.1.8

proxysql/templates/daemonset.yaml

@@ -49,6 +49,11 @@ spec:
         - name: {{ .Values.name }}
           mountPath: {{ .Values.daemonset.containers.volumeMounts.proxysql.mountPath }}
           subPath: {{ .Values.daemonset.containers.volumeMounts.proxysql.subPath }}
+        env:
+        {{- range $key, $value := .Values.daemonset.containers.env }}
+        - name: {{ $key }}
+          value: {{ $value | quote }}
+        {{- end }}
       volumes:
       - name: {{ .Values.name }}
         configMap:

proxysql/values.yaml

@@ -48,6 +48,7 @@ daemonset:
       proxysql:
         mountPath: "/etc/proxysql.cnf"
         subPath: "proxysql.cnf"
+    env: {}
   volumes:
     proxysql:
       configmap: "proxysql"