fix: CI workflow improvements and test config patch path fix

.github/workflows/publish.yml

@@ -3,8 +3,11 @@ name: Publish
 on:
   workflow_dispatch:
   push:
+    branches: [main]
     tags:
       - "v*"
+  pull_request:
+    branches: [main]
 
 permissions:
   contents: read
@@ -43,6 +46,7 @@ jobs:
   publish:
     needs: build
     runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/v')
     environment:
       name: pypi
       url: https://pypi.org/p/ctfd-mcp

tests/test_config.py

@@ -19,7 +19,7 @@ from ctfd_mcp.config import load_config
 
 def _load_with_env(env: dict[str, str]):
     """Load config with isolated env and no .env side effects."""
-    with patch("config.load_dotenv", return_value=None):
+    with patch("ctfd_mcp.config.load_dotenv", return_value=None):
         with patch.dict(os.environ, env, clear=True):
             return load_config()