Ensure env files available on CI ui tests

Author: Themitchell

.github/workflows/stage-4-acceptance.yaml

@@ -87,6 +87,7 @@ jobs:
         uses: actions/checkout@v5
       - name: "Run UI test"
         run: |
+          cp .env.example .env
           make test-ui
       - name: "Save result"
         run: |