Use native git checkout and streamline tests in Gitea workflows

.gitea/workflows/release.yaml

@@ -17,7 +17,12 @@ jobs:
       image: composer:2
 
     steps:
-      - uses: actions/checkout@v3
+      - name: Checkout
+        run: |
+          git init .
+          git remote add origin "https://${{ github.actor }}:${{ secrets.GITHUB_TOKEN }}@$(echo "${{ github.server_url }}" | sed -E 's|https?://||')/${{ github.repository }}.git"
+          git fetch --depth 1 origin "${{ github.ref }}"
+          git checkout FETCH_HEAD
 
       - name: Build release zip
         run: |