Add GitHub Actions workflow for testing multiple containers

.github/workflows/test.yml

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+name: Test Matrix
+
+on: [push, pull_request]
+
+jobs:
+  test-distros:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        container:
+          - 'debian:11'
+          - 'debian:12'
+          - 'ubuntu:22.04'
+          - 'alpine:latest'
+          - 'almalinux:9'        # 推荐：CentOS 9 的完美替代
+          - 'rockylinux:9'       # 推荐：CentOS 9 的完美替代
+          - 'centos:7'           # 官方 CentOS 7 (需修复源)
+          - 'quay.io/centos/centos:stream9' # 官方 CentOS Stream 9 (原生可用)
+
+    container:
+      image: ${{ matrix.container }}
+      options: --privileged
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      # === 关键：针对旧版 CentOS 的“起死回生”补丁 ===
+      - name: Fix CentOS EOL Repos
+        run: |
+          # 如果是 CentOS 8 (已死)，需要切到 vault 源
+          if grep -q "CentOS Linux 8" /etc/os-release 2>/dev/null; then
+            sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
+            sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
+          fi
+          
+          # 如果是 CentOS 7 (已死)，同样需要切到 vault 源
+          if grep -q "CentOS Linux 7" /etc/os-release 2>/dev/null; then
+            sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-Base.repo
+            sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-Base.repo
+          fi
+
+      - name: Pre-install basic requirements
+        run: |
+          if [ -f /etc/alpine-release ]; then
+            apk add --no-cache curl sudo openssh-server
+          elif [ -f /etc/debian_version ]; then
+            apt-get update && apt-get install -y curl sudo openssh-server
+          elif [ -f /etc/redhat-release ]; then
+            # CentOS/Alma/Rocky 都在这里
+            dnf install -y curl sudo openssh-server || yum install -y curl sudo openssh-server
+          fi
+
+      - name: Run Init Script
+        run: |
+          chmod +x init.sh
+          ./init.sh --user=root --port=2222 --key-raw="ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPQQDejyTCPJO3Jyw5UX9jmojb/zjgcqVuRO28fmpWU5" --no-update --bbr --delay-restart --yes --strict