Fixed docker build (#2881)

### What problem does this PR solve?

Fixed docker build

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

Dockerfile

@@ -48,6 +48,7 @@ RUN --mount=type=cache,id=ragflow_builder_apt,target=/var/cache/apt,sharing=lock
     rm -rf /var/lib/apt/lists/*
 
 COPY web web
+COPY api api
 RUN --mount=type=cache,id=ragflow_builder_npm,target=/root/.npm,sharing=locked \
     cd web && npm i --force && npm run build
 

Dockerfile.slim

@@ -47,6 +47,7 @@ RUN --mount=type=cache,id=ragflow_builder_apt,target=/var/cache/apt,sharing=lock
     rm -rf /var/lib/apt/lists/*
 
 COPY web web
+COPY api api
 RUN --mount=type=cache,id=ragflow_builder_npm,target=/root/.npm,sharing=locked \
     cd web && npm i --force && npm run build