chore: check if access token was generated

Author: Amzani

.github/workflows/sdk_generation.yaml

@@ -31,6 +31,14 @@ jobs:
           private-key: ${{ secrets.GH_CI_BOT_APP_PRIVATE_KEY }}
           owner: apideck-libraries
 
+      - name: Verify token was created
+        run: |
+          if [ -z "${{ steps.app-token.outputs.token }}" ]; then
+            echo "::error::GitHub App token was not created"
+            exit 1
+          fi
+          echo "Token created successfully"
+
   generate:
     needs: generate-token
     uses: speakeasy-api/sdk-generation-action/.github/workflows/workflow-executor.yaml@v15