fix: Specify Dockerfile in release workflow

- Added the Dockerfile path to the release workflow to ensure proper context for the build process.

Author: 239573049

.github/workflows/release.yml

@@ -92,6 +92,7 @@ jobs:
     - uses: docker/build-push-action@v5
       with:
         context: .
+        file: src/ClaudeCodeProxy.Host/Dockerfile
         platforms: linux/amd64,linux/arm64
         push: true
         tags: ${{ steps.meta.outputs.tags }}