fix: add AWS credentials to sam package step for issue #2

- Added `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` environment variables to the `sam package` step
- Ensures credentials are available for uploading Lambda code to S3
- Progress toward resolving issue #2 by fixing missing credentials error

.github/workflows/deploy-to-lambda.yml

@@ -22,6 +22,9 @@ jobs:
           pip install aws-sam-cli
 
       - name: Package the SAM Application
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
         run: |
           sam package --template-file template.yml --s3-bucket your-s3-bucket-name --output-template-file packaged.yaml --region us-east-2