fix tgi recipe

Author: stelios-ritual

services/tgi-client-inference/2.0.0/recipe.json

@@ -5,10 +5,7 @@
         "description": "TGI Client Inference Service",
         "command": "--bind=0.0.0.0:3000 --workers=${NUM_WORKERS}",
         "env": {
-            "TGI_INF_WORKFLOW_POSITIONAL_ARGS": [
-                "${SERVICE_URL}",
-                "${CONNECTION_TIMEOUT}"
-            ]
+            "TGI_INF_WORKFLOW_POSITIONAL_ARGS": "[\"${SERVICE_URL}\",\"${CONNECTION_TIMEOUT}\"]"
         },
         "external": true,
         "gpu": false,