fix: Install python first

.gitea/workflows/check.yml

@@ -7,7 +7,12 @@ jobs:
   RuffCheck:
     runs-on: [ubuntu-latest, amd]
     steps:
-      - uses: actions/checkout@v2
+      - name: Checkout repository
+        uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
       - name: Install Ruff
         run: pip install ruff
       - name: Run Ruff