When I run my application through docker-compose up, it builds and runs without any issues. When I try to host it on Docker Hub, it fails to build with the error COPY failed: no source files were specified. I believe it is because the Dockerfile is not in the root directory.

My folder structure is like this:

root
-- docker-compose.yml
-- app
   -- Dockerfile
   -- package.json
   -- package-lock.json
   -- src
      -- .....

My Dockerfile is below, and when I run docker-compose up (which points to the Dockerfile within /app) it runs fine:

FROM node:8.10.0-alpine
WORKDIR /usr/src/app
COPY package*.json /usr/src/app/
RUN npm install --production
COPY . /usr/src/app
EXPOSE 4000
CMD ["npm", "run", "app"]

I am wanting to host my project on Docker Hub, but I'm getting the following error:

Step 1/7 : FROM node:8.10.0-alpine
---> adc4b0f5bc53
Step 2/7 : WORKDIR /usr/src/app
Removing intermediate container 743246352cea
---> 3dcb720d4618
Step 3/7 : COPY package*.json /usr/src/app/
COPY failed: no source files were specified

The build rules I've set to point to the correct Dockerfile location is below:

Is my Dockerfile wrong, or am I not configuring Docker Hub correctly when I try to hook it up to my GitHub repo?

For context, the GitHub repo is here.