chore: add env variable to build script

Signed-off-by: Anthony D. Mays <anthony@morganlatimer.com>

Author: anthonydmays

.github/workflows/check_fullstack_demo_ts_pr.yaml

@@ -32,6 +32,8 @@ jobs:
     
     - name: Run Cypress component tests
       uses: cypress-io/github-action@v6
+      env:
+        NEXT_PUBLIC_API_URL: http://localhost:8080
       with:
         working-directory: ./lib/javascript/fullstack_demo
         component: true