pref: add web submodule

.gitmodules

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+[submodule "web"]
+	path = web
+	url = https://git.thehrz.net/thehrz/ipv6-test.git

Dockerfile

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+FROM golang:1.22 as build-stage
+
+WORKDIR /app
+ENV GOPROXY https://goproxy.cn,direct
+
+COPY . .
+RUN go build -o app .
+
+CMD ["/app/app"]

docker-compose.yml

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+version: "3.8"
+
+networks:
+  traefik:
+    name: traefik
+    external: true
+  ipv6-test:
+    name: ipv6-test
+
+services:
+  frontend:
+    build: ./web
+    container_name: ipv6-test-frontend
+    restart: always
+    labels:
+      - traefik.enable=true
+      - traefik.http.routers.ipv6-test.rule=Host(`ipv6-test.thehrz.net`)
+      - traefik.http.routers.ipv6-test.entrypoints=web,websecure
+      - traefik.http.routers.ipv6-test.tls.certresolver=letsencrypt
+      - traefik.http.services.ipv6-test.loadbalancer.server.port=3000
+    networks:
+      - traefik
+      - ipv6-test
+  backend:
+    build: .
+    container_name: ipv6-test-backend
+    restart: always
+    networks:
+      - traefik
+      - ipv6-test

web

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+Subproject commit 65b25e7ef3883695126228a3f98f3efdab07ef60