Set up multiple os tests

.github/workflows/run-tests.yml

@@ -26,8 +26,13 @@ permissions:
 
 jobs:
   run_tests:
-    name: Run tests
-    runs-on: ubuntu-latest
+    name: Python ${{ matrix.python-version }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: ["3.10"]
+      fail-fast: false
 
     steps:
       - uses: actions/checkout@v4
@@ -35,8 +40,8 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v4
 
-      - name: Set up Python
-        run: uv python install 3.11
+      - name: Set up Python ${{ matrix.python-version }}
+        run: uv python install ${{ matrix.python-version }}
 
       - name: Install FastMCP
         run: uv sync --extra dev