fix: CI with python installation

.gitea/workflows/ci.yml

@@ -8,14 +8,19 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - name: Check environment
+      - name: Install Python
         run: |
-          echo "PATH=$PATH"
-          which python || echo "python not found"
-          which python3 || echo "python3 not found"
-          which pip || echo "pip not found"
-          which pip3 || echo "pip3 not found"
-          ls /usr/bin/python* 2>/dev/null || echo "No python in /usr/bin"
-          ls /usr/local/bin/python* 2>/dev/null || echo "No python in /usr/local/bin"
-      - name: Check OS
-        run: cat /etc/os-release
+          apt-get update -qq
+          apt-get install -y -qq python3 python3-pip
+      - name: Verify Python
+        run: |
+          python3 --version
+          pip3 --version
+      - name: Install deps
+        run: pip3 install -e ".[dev]"
+      - name: Lint
+        run: ruff check src/
+      - name: Type check
+        run: mypy src/
+      - name: Test
+        run: pytest tests/ -v