fix: github action

Author: cristipufu

.github/workflows/build-github-mcp-server.yml

@@ -49,6 +49,7 @@ jobs:
         run: |
           mkdir -p temp
           cp cmd/github-mcp-server/github-mcp-server temp
+          chmod +x temp/github-mcp-server
 
       - name: Create MCP config file
         run: |