ci: fetch the access key id from the right place

Author: pietroalbini

.github/workflows/main.yml

@@ -32,6 +32,6 @@ jobs:
           region: us-west-1
           redeploy_ecs_cluster: rust-ecs-prod
           redeploy_ecs_service: rust-log-analyzer
-          aws_access_key_id: "${{ env.AWS_ACCESS_KEY_ID }}"
+          aws_access_key_id: "${{ secrets.AWS_ACCESS_KEY_ID }}"
           aws_secret_access_key: "${{ secrets.AWS_SECRET_ACCESS_KEY }}"
         if: github.ref == 'refs/heads/master'