ci: free docker space before quality image

.gitea/workflows/ci-cd.yml

@@ -48,6 +48,15 @@ jobs:
           git -c core.hooksPath=/dev/null clone --depth=1 --branch="${BRANCH}" "${REPO_URL}" .
           git -c core.hooksPath=/dev/null checkout "${GITHUB_SHA}"
 
+      - name: Free Docker space
+        run: |
+          set -euo pipefail
+          docker system df || true
+          docker buildx prune --all --force || true
+          docker builder prune --all --force || true
+          docker system prune --all --force --volumes || true
+          docker system df || true
+
       - name: Run quality in golden image
         env:
           GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}