fix: use lowercase repository name for container image (#807)

GitHub Container Registry requires lowercase image names. Use bash
parameter expansion to convert repository name to lowercase.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/smtp_proxy_server.yml

@@ -36,6 +36,9 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
+      - name: Set lowercase repository name
+        run: echo "REPO_LOWER=${GITHUB_REPOSITORY,,}" >> $GITHUB_ENV
+
       - name: Build and push Docker images
         uses: docker/build-push-action@v5
         with:
@@ -44,5 +47,5 @@ jobs:
           platforms: linux/amd64,linux/arm64
           push: true
           tags: |
-            ${{ env.REGISTRY }}/${{ github.repository }}/${{ env.IMAGE_NAME }}:${{ github.ref_name }}
-            ${{ env.REGISTRY }}/${{ github.repository }}/${{ env.IMAGE_NAME }}:latest
+            ${{ env.REGISTRY }}/${{ env.REPO_LOWER }}/${{ env.IMAGE_NAME }}:${{ github.ref_name }}
+            ${{ env.REGISTRY }}/${{ env.REPO_LOWER }}/${{ env.IMAGE_NAME }}:latest

CHANGELOG.md

@@ -15,6 +15,7 @@
 ### Features
 
 - feat: |Admin| 新增管理员账号页面，显示当前登录方式并支持退出登录（仅限密码登录方式）
+- fix: |GitHub Actions| 修复容器镜像名需要全部小写的问题
 - feat: |邮件转发| 新增来源地址正则转发功能，支持按发件人地址过滤转发，完全向后兼容
 - feat: |地址来源| 新增地址来源追踪功能，记录地址创建来源（Web 记录 IP，Telegram 记录用户 ID，Admin 后台标记）
 - feat: |邮件过滤| 移除后端 keyword 参数，改为前端过滤当前页邮件，优化查询性能

CHANGELOG_EN.md

@@ -15,6 +15,7 @@
 ### Features
 
 - feat: |Admin| Add admin account page, display current login method and support logout (password login only)
+- fix: |GitHub Actions| Fix container image name must be lowercase
 - feat: |Email Forwarding| Add source address regex forwarding, filter by sender address, fully backward compatible
 - feat: |Address Source| Add address source tracking feature, record address creation source (Web records IP, Telegram records user ID, Admin panel marked)
 - feat: |Email Filtering| Remove backend keyword parameter, switch to frontend filtering of current page emails, optimize query performance