[CI] add Docker in Docker as a service for E2E tests

.woodpecker/build-and-e2e.yaml

@@ -2,6 +2,13 @@ when:
   - event: [push, manual, pull_request]
     branch: [main]
 
+services:
+  docker:
+    image: docker:28-dind
+    privileged: true
+    environment:
+      DOCKER_TLS_CERTDIR: ""
+
 steps:
   prepare-fe-image-tags:
     image: alpine:3.21
@@ -61,6 +68,8 @@ steps:
       - build-and-push-fe-image
       - build-and-push-e2e-image
     environment:
+      DOCKER_HOST: tcp://localhost:2375
+      DOCKER_TLS_CERTDIR: ""
       GITEA_PACKAGES_USERNAME:
         from_secret: gitea_packages_username
       GITEA_PACKAGES_TOKEN: