ci: fix pipeline to include healthchat workspace plugin

.github/workflows/build-healthchat.yaml

@@ -5,13 +5,6 @@ on:
     push:
         branches:
             - release/healthchat
-    workflow_dispatch:
-        inputs:
-            healthchat_workspace_ref:
-                description: "healthchat-workspace git ref (tag, branch, or SHA). Leave empty for default branch."
-                required: false
-                default: ""
-                type: string
 
 jobs:
     build-healthchat-app:
@@ -28,6 +21,7 @@ jobs:
             DOCKER_PUSH: true
             DOCKER_SIGNING: false
             FORCE_COLOR: 1
+            HEALTHCHAT_WORKSPACE_REF: v0.4.0-rc
         steps:
             - uses: actions/checkout@v4
               with:
@@ -38,7 +32,7 @@ jobs:
                   repository: Novaloop-AG/healthchat-workspace
                   path: healthchat-workspace
                   token: ${{ secrets.HEALTHCHAT_WORKSPACE_TOKEN }}
-                  ref: ${{ github.event.inputs.healthchat_workspace_ref || '' }}
+                  ref: ${{ env.HEALTHCHAT_WORKSPACE_REF }}
             - name: Setup Node.js
               uses: actions/setup-node@v4
               with: