Provide inert Supabase env for CI builds

Author: geraldarthurdavis

.github/workflows/ci.yml

@@ -21,6 +21,9 @@ jobs:
   lint-build:
     name: Lint, Type-Check & Build
     runs-on: ubuntu-latest
+    env:
+      NEXT_PUBLIC_SUPABASE_URL: http://127.0.0.1:54321
+      NEXT_PUBLIC_SUPABASE_ANON_KEY: ci-placeholder-anon-key
 
     steps:
       - name: Checkout repository