react with docker with caprover

Dockerfile
# build environment
FROM node:9.6.1 as builder
RUN mkdir /usr/src/app
WORKDIR /usr/src/app
ENV PATH /usr/src/app/node_modules/.bin:$PATH
COPY . /usr/src/app
RUN npm install
RUN npm run build

# production environment
FROM nginx:1.13.9-alpine
RUN rm -rf /etc/nginx/conf.d
RUN mkdir -p /etc/nginx/conf.d
COPY ./default.conf /etc/nginx/conf.d/
COPY --from=builder /usr/src/app/build /usr/share/nginx/html
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]

default.conf 
server {
  listen 80;
  location / {
    root   /usr/share/nginx/html;
    index  index.html index.htm;
    try_files $uri $uri/ /index.html;
  }
  error_page   500 502 503 504  /50x.html;
  location = /50x.html {
    root   /usr/share/nginx/html;
  }
}


captain-definition

{
    "schemaVersion": 2,
    "dockerfilePath": "./DockerFile"
}