In my recent project I've come to use Git Submodules, however I'm struggling to get my Docker container to download the information from the submodule on deployment.

Here's my Dockerfile (disclaimer: I am using CapRover, so their Dockerfile is formatted different, but everything is the same):

        "FROM library/node:16.6.0-alpine",
        "RUN apk update && apk upgrade &&     apk add --no-cache git", 
        "RUN mkdir -p /usr/src/app",
        "WORKDIR /usr/src/app",
        "COPY ./package.json /usr/src/app/",
        "RUN npm install --production && npm cache clean --force",
        "WORKDIR ./Status-Plus-Translation/",
        "RUN git submodule update --recursive --remote",
        "WORKDIR /usr/src/app",
        "COPY ./ /usr/src/app",
        "ENV NODE_ENV production",
        "ENV PORT 80",
        "EXPOSE 80",
        "CMD [ \"npm\", \"start\" ]"

For clarification, this is what my project's files look like:

When I run the top Dockerfile code, I get the following error: