add type checking to CI (1)

.github/workflows/type-checking.yml

@@ -0,0 +1,24 @@
+name: Type-check Ryven and ryvencore-qt using mypy
+on:
+    push:
+        branches:
+        - main
+        - dev
+    pull_request:
+        branches:
+        - '*'
+    workflow_dispatch:
+jobs:
+  Build-and-Publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: 3.x
+          architecture: x64
+      - name: Install ryvencore
+        run: python -m pip install ryvencore --user
+      - name: Typecheck
+        run: mypy
+        working-directory: .