ci: avoid GitHub action downloads

.gitea/workflows/ci.yml

@@ -20,35 +20,33 @@ jobs:
           --health-timeout 5s
           --health-retries 20
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version: "3.11"
-          cache: pip
+      - uses: https://gitea.com/actions/checkout@v4
+      - name: Show Python version
+        run: python3 --version
       - name: Install MySQL build dependencies
         run: |
           sudo apt-get update
           sudo apt-get install -y default-libmysqlclient-dev pkg-config
       - name: Install dependencies
-        run: pip install -r requirements-dev.txt
+        run: python3 -m pip install -r requirements-dev.txt
       - name: Check migrations
         working-directory: backend
-        run: python manage.py makemigrations --check --dry-run
+        run: python3 manage.py makemigrations --check --dry-run
       - name: Django checks
         working-directory: backend
-        run: python manage.py check
+        run: python3 manage.py check
       - name: ASGI import check
         working-directory: backend
-        run: python -c "from config.asgi import application; print(type(application).__name__)"
+        run: python3 -c "from config.asgi import application; print(type(application).__name__)"
       - name: Unit tests
-        run: pytest -q
+        run: python3 -m pytest -q
       - name: MySQL migrations and tests
         env:
           DATABASE_URL: mysql://root:ci-root-password@mysql:3306/hulumath
         run: |
-          python backend/manage.py check --database default
-          python backend/manage.py check_mysql
-          python backend/manage.py migrate --noinput
-          pytest -q
+          python3 backend/manage.py check --database default
+          python3 backend/manage.py check_mysql
+          python3 backend/manage.py migrate --noinput
+          python3 -m pytest -q
       - name: Build image
         run: docker build -t hulumath:${{ gitea.sha }} .