[plex] Quote values for extraEnv (#361)

Ensure we always use a string and prevent accidental usage of incorrect type
(such as using true or false as values)

charts/plex/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 appVersion: 1.20.2.3402
 description: Plex Media Server
 name: plex
-version: 2.1.0
+version: 2.1.1
 keywords:
   - plex
 home: https://plex.tv/

charts/plex/templates/deployment.yaml

@@ -175,7 +175,7 @@ spec:
 # Extra ENV Values supplied by user
 {{- range $key, $value := .Values.extraEnv }}
           - name: {{ $key }}
-            value: {{ $value }}
+            value: "{{ $value }}"
 {{- end }}
 # This is part of pkcsMangler
 {{- if .Values.certificate.pkcsMangler.enabled }}
@@ -310,7 +310,7 @@ spec:
       - name: {{ .name }}
         persistentVolumeClaim:
           claimName: {{ .claimName }}
-  {{- end }}        
+  {{- end }}
 {{- end }}
       - name: shared
         emptyDir: {}