feat(web/ez-http): 添加题目信息、构建文件和工作流文件 (#3)

* feat(web/ez-http): 添加构建文件和题目信息

* ci(web/ez-http): 添加工作流文件

* fix(web/ez-http): 使用 `HTTP_X_FORWARDED_FOR` 判断来源 IP

.github/workflows/web.ez_http.yml

@@ -0,0 +1,50 @@
+name: Challenge ezHTTP
+
+on:
+  push:
+    branches: ["main"]
+    paths:
+      - "!**/README.md"
+      - "challenges/web/ez_http/build/**"
+  workflow_dispatch:
+
+env:
+  TYPE: web
+  NAME: ez_http
+  REGISTRY: ghcr.io
+
+jobs:
+  challenge-build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository }}/${{ env.NAME }}
+          tags: |
+            latest
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: challenges/${{ env.TYPE }}/${{ env.NAME }}/build
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          push: true

challenges/web/ez_http/README.md

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+# ezHTTP
+
+- 作者：-
+- 参考：-
+- 难度：Baby
+- 分类：Web
+- 镜像：-
+- 端口：-
+
+## 题目描述
+
+<description>
+
+## 题目解析
+
+<analysis>

challenges/web/ez_http/build/Dockerfile

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+FROM ghcr.io/svuctf/base-v2/php-nginx:8.3
+
+COPY --chown=www-data /html /var/www/html

challenges/web/ez_http/build/html/index.php

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+<?php
+
+if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], "127") === 0) {
+    if ($_SERVER["HTTP_REFERER"] === "genshin.edu.cn") {
+        if ($_SERVER["HTTP_USER_AGENT"] === "svuctf") {
+            echo "flag在小饼干里!";
+            setcookie("flag", file_get_contents("/flag"));
+        } else {
+            echo "请使用 svuctf 浏览器!";
+        }
+    } else {
+        echo "不是 genshin.edu.cn 来的我不要";
+    }
+} else {
+    echo "必须从本地访问!";
+}