pass the feed URL via env var rather than config map so that standalone Docker usage is simplified

helm/templates/frontend-deployment.yaml

@@ -59,19 +59,12 @@ spec:
             mountPath: /etc/nginx/nginx.conf
             subPath: nginx.conf
             readOnly: true
-          - name: env-config
-            mountPath: /usr/share/nginx/html/env-config.js
-            subPath: env-config.js
-            readOnly: true
           resources:
             {{- toYaml .Values.resources | nindent 12 }}
       volumes:
         - name: nginx
           configMap:
             name: frontend-nginx
-        - name: env-config
-          configMap:
-            name: frontend-env-config
       {{- with .Values.nodeSelector }}
       nodeSelector:
         {{- toYaml . | nindent 8 }}

helm/templates/frontend-env-config.yaml

@@ -1,10 +0,0 @@
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: frontend-env-config
-data:
-  env-config.js: |
-    window.process_env = {
-      SUBSTRATE_TELEMETRY_URL: "wss://feed.telemetry.parity-stg.parity.io/feed",
-      SUBSTRATE_TELEMETRY_SAMPLE: "",
-    }

helm/values.yaml

@@ -26,7 +26,10 @@ fullnameOverride: ""
 envVars:
   shard: {}
   core: {}
-  frontend: {}
+  frontend:
+    # The frontend docker container makes this available to the UI,
+    # so that it knows where to look for feed information:
+    SUBSTRATE_TELEMETRY_URL: wss://feed.telemetry.parity-stg.parity.io/feed