修复：GitHub Actions Docker 推送权限问题

- 添加 packages: write 权限
- 修正 Docker 镜像名称大小写问题
- 明确指定镜像推送目标为 ghcr.io/zy84338719/filecodebox

Author: zy84338719

.github/workflows/build.yml

@@ -8,6 +8,10 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+  packages: write
+
 jobs:
   build:
     name: Build for multiple platforms
@@ -155,7 +159,10 @@ jobs:
     name: Build and push Docker image
     runs-on: ubuntu-latest
     needs: build
-    if: github.event_name == 'push' && (startsWith(github.ref, 'refs/tags/') || github.ref == 'refs/heads/main')
+    if: startsWith(github.ref, 'refs/tags/')
+    permissions:
+      contents: read
+      packages: write
 
     steps:
     - name: Checkout code
@@ -175,14 +182,12 @@ jobs:
       id: meta
       uses: docker/metadata-action@v5
       with:
-        images: ghcr.io/${{ github.repository }}
+        images: ghcr.io/zy84338719/filecodebox
         tags: |
           type=semver,pattern={{version}}
           type=semver,pattern={{major}}.{{minor}}
           type=semver,pattern={{major}}
-          type=raw,value=latest,enable={{is_default_branch}}
-          type=ref,event=branch
-          type=raw,value=dev,enable={{is_default_branch}}
+          type=raw,value=latest
         labels: |
           org.opencontainers.image.title=FileCodeBox
           org.opencontainers.image.description=高性能文件分享服务 - Go语言实现
@@ -298,9 +303,9 @@ jobs:
         
         **Docker 镜像:**
         \`\`\`bash
-        docker pull ghcr.io/${{ github.repository }}:${{ github.ref_name }}
+        docker pull ghcr.io/zy84338719/filecodebox:${{ github.ref_name }}
         # 或者最新版本
-        docker pull ghcr.io/${{ github.repository }}:latest
+        docker pull ghcr.io/zy84338719/filecodebox:latest
         \`\`\`
         
         ### 🔧 快速开始