try

.gitea/workflows/test.yaml

@@ -6,5 +6,13 @@ jobs:
   build:
     runs-on: alpine-tmw
     steps:
+      - name: Configure Docker daemon for IPv6
+        run: |
+          echo '{
+            "ipv6": true,
+            "fixed-cidr-v6": "fd00::/64",
+            "experimental": true
+          }' | sudo tee /etc/docker/daemon.json
+          sudo systemctl restart docker
       - name: ping google.com
         run: ping google.com