feat(helm): add env.js ConfigMap mount support

Add envJs.configMap option to mount external ConfigMap for env.js.
This allows Helm deployments to use the same runtime config pattern
where env.js only sets configEndpoint=true and KEYCLOAK_CLIENT_ID.

IMPORTANT: The ConfigMap should be minimal - all other config comes
from /api/config. See wiki: Configuration-Management

Author: danieltruong

helm/eagle-admin/templates/deployment.yaml

@@ -63,6 +63,18 @@ spec:
               value: {{ $value | quote }}
             {{- end }}
           {{- end }}
+          {{- if .Values.envJs.configMap }}
+          volumeMounts:
+            - name: env-js
+              mountPath: /tmp/app/dist/admin/env.js
+              subPath: env.js
+          {{- end }}
+      {{- if .Values.envJs.configMap }}
+      volumes:
+        - name: env-js
+          configMap:
+            name: {{ .Values.envJs.configMap }}
+      {{- end }}
       dnsPolicy: ClusterFirst
       restartPolicy: Always
       securityContext: {}

helm/eagle-admin/values-prod.yaml

@@ -20,6 +20,12 @@ podDisruptionBudget:
   enabled: true
   minAvailable: 1
 
+# Mount existing ConfigMap for env.js
+# IMPORTANT: ConfigMap should only contain configEndpoint=true and KEYCLOAK_CLIENT_ID
+# All other config comes from /api/config. See wiki: Configuration-Management
+envJs:
+  configMap: "eagle-admin-env-js"
+
 env:
   DEPLOYMENT_ENVIRONMENT: "prod"
   BANNER_COLOUR: ""

helm/eagle-admin/values.yaml

@@ -62,6 +62,13 @@ env:
   REMOTE_PUBLIC_PATH: ""
   KEYCLOAK_CLIENT_ID: "eagle-admin-console"
 
+# env.js ConfigMap - mount external ConfigMap to override built-in env.js
+# Set configMap name to use existing ConfigMap, leave empty to use container's built-in env.js
+# IMPORTANT: Only set configEndpoint=true and KEYCLOAK_CLIENT_ID in this ConfigMap
+# All other config comes from /api/config. See wiki: Configuration-Management
+envJs:
+  configMap: ""  # e.g., "eagle-admin-env-js"
+
 # Pod annotations
 podAnnotations: {}