ci: add mypy action

.github/workflows/mypy.yml

@@ -0,0 +1,24 @@
+name: mypy
+
+on: [push, pull_request]
+
+jobs:
+  docs:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          version: "0.5.26"
+
+          enable-cache: true
+          cache-dependency-glob: "uv.lock"
+
+      - name: Install dependencies
+        run: uv sync --dev
+
+      - name: Run mypy
+        run: uv run mypy rdfproxy/