fix syntax errors

k8s-manifests/imageserver-deployment.yml

@@ -29,12 +29,12 @@ spec:
                 mountPath: /home/cantaloupe/images
             env:
               - name: CACHE_SERVER_DERIVATIVE_ENABLED
-                value: true
+                value: 'true'
               - name: CACHE_SERVER_DERIVATIVE
-                value: RedisCache
+                value: 'RedisCache'
               - name: REDISCACHE_HOST
-                value: redis:6379
-      restartPoliy: Always
+                value: 'redis:6379'
+      restartPolicy: Always
       volumes:
           - name: image-volume
             persistentVolumeClaim: