Add NGINX_VERSION parameter into the template

Author: hhorak

openshift/templates/nginx.json

@@ -93,7 +93,7 @@
             "from": {
               "kind": "ImageStreamTag",
               "namespace": "${NAMESPACE}",
-              "name": "nginx:1.12"
+              "name": "nginx:${NGINX_VERSION}"
             }
           }
         },
@@ -228,6 +228,13 @@
       "required": true,
       "value": "openshift"
     },
+    {
+      "name": "NGINX_VERSION",
+      "displayName": "NGINX Version",
+      "description": "Version of NGINX image to be used (1.12 by default).",
+      "required": true,
+      "value": "1.12"
+    },
     {
       "name": "MEMORY_LIMIT",
       "displayName": "Memory Limit",