Update workflow with environmental variables

Author: RajashekarRaju

.github/workflows/main.yml

@@ -10,7 +10,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     env:
-      OPEN_API_KEY: ${{ secrets.OPEN_API_KEY }}
+      GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}
 
     steps:
       - name: Checkout