add mypy workflow

.github/workflows/mypy.yaml

@@ -0,0 +1,30 @@
+name: Mypy
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  mypy:
+    runs-on: ubuntu-latest
+    env:
+      UV_CACHE_DIR: /tmp/.uv-cache
+    steps:
+      - name: Install git-annex
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y git-annex
+      - name: Check out the repository
+        uses: https://github.com/RouxAntoine/checkout@v4.1.8
+        with:
+          show-progress: true
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+        with:
+          python-version: ${{ matrix.python-version }}
+          enable-cache: true
+      - name: Install corrlib
+        run: uv sync --locked --all-extras --dev --python "3.12""
+      - name: Run tests
+        run: uv run mypy corrlib