fix(ci): 修正 Release workflow 確保 Docker Image 正確發佈

- dockerhub-description.yml:
  - 修正 IMAGE_NAME 為 convertx/convertx-cn
  - 新增 continue-on-error 避免阻擋 Release
  - 新增 workflow_run 觸發器

- release.yml:
  - 新增 workflow_dispatch 手動觸發支援
  - 新增 permissions 設定
  - 優化 disk cleanup 錯誤處理

- docker-publish.yml:
  - 修正 DOCKERHUB_USERNAME 從 secrets 讀取
  - 修正 DOCKER_IMAGE 為正確的 convertx/convertx-cn

.github/workflows/docker-publish.yml

@@ -1,6 +1,8 @@
 name: Docker
 
 # thanks to https://github.com/sredevopsorg/multi-arch-docker-github-workflow
+# This workflow builds and publishes to GHCR (GitHub Container Registry)
+# For Docker Hub releases, see release.yml
 
 on:
   push:
@@ -9,9 +11,12 @@ on:
   pull_request:
     branches: ["main"]
   workflow_dispatch:
+
 env:
-  IMAGE_NAME: ${{ github.repository }}
-  DOCKERHUB_USERNAME: c4illin
+  # GitHub Container Registry image name
+  GHCR_IMAGE: ghcr.io/${{ github.repository }}
+  # Docker Hub image name (for merge job)
+  DOCKER_IMAGE: convertx/convertx-cn
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -161,7 +166,7 @@ jobs:
         with:
           images: |
             ghcr.io/${{ env.REPO }}
-            ${{ env.IMAGE_NAME }}
+            ${{ env.DOCKER_IMAGE }}
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -176,7 +181,7 @@ jobs:
       - name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
-          username: ${{ env.DOCKERHUB_USERNAME }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Get execution timestamp with RFC3339 format