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[solved] Docker-compose running into errors - misconfiguration for sure, but I'm lost and confused

Hello, I’m a bit new here and signed up just because of this issue I’m having and busting my head because of it…

I am totally new to docker and docker compose (ofc), started a few days ago with docker in general.

So the issue I’m having is as follows;
I have one root folder for a project which includes the app and server.

\_ server
    \_ dockerfile
    \_ package.json
    \_ index.js
    \_ ...
\_ app
    \_ dist
      \_ ...
    \_ dockerfile
    \_ package.json
    \_ index.js
    \_ ...

The docker-compose.yml includes the following

docker-compose.yml content
version: "3.4"
    container_name: projectmanagerApp
    restart: always
      context: ./app
      dockerfile: ./app/dockerfile
      - "80:8000"
      - server
      test: ["CMD", "curl", "-f", "http://localhost:8000"]
      interval: 1m30s
      timeout: 10s
      retries: 3
      start_period: 30s
      - projectmanagerNET

    container_name: projectmanagerServer
    restart: always
    image: node:10
    build: ./server
      - "81:8001"
      - 8001
    # links:
    #   - mongo
    # depends_on:
    #   - mongo
      test: ["CMD", "curl", "-f", "http://localhost:8001"]
      interval: 1m30s
      timeout: 10s
      retries: 3
      start_period: 30s
      - projectmanagerNET

  # mongo:
  #   container_name: projectmanagerMongo
  #   image: mongo
  #   dns:
  #     -
  #     -
  #   expose:
  #     - "27017"
  #   healthcheck:
  #     test: ["CMD", "echo", "'db.runCommand(\"ping\").ok'", "|", "mongo", "localhost:27017/test", "--quiet"]
  #     interval: 1m30s
  #     timeout: 10s
  #     retries: 3
  #     start_period: 30s
  #   networks: 
  #     - projectmanagerNET

/app/dockerfile contents
### Initialisation
#Define the base image - using node v.10, official docker image
FROM node:10
#Define the maintainer of this image
LABEL maintainer=""
#Define the working directory (on final container)
WORKDIR /var/app
#Set the default registry for NPM
RUN npm config set registry

### Build process
# Copy the package.json, package-lock.json from host machine to build container
COPY package*.json ./
# Install all dependencies on the build container
RUN npm install --quiet

### Post build process
#Copy all the files from the build container to final container
COPY . .
#Start the server in the container
CMD [ "npm", "run", "serve" ]

Both subapps (app, server) can be build using docker build --rm --tag testingImage . and run using docker run --name testContainer testingImage and both startup without any errors at all.

But when using docker-compose I get the following errors:

Starting projectmanagerServer ... done
Starting projectmanagerApp    ... done
Attaching to projectmanagerServer, projectmanagerApp
projectmanagerApp | 
projectmanagerApp | > projectmanager-app@0.0.1 serve /var/app
projectmanagerApp | > node server.js
projectmanagerApp | 
projectmanagerApp | internal/modules/cjs/loader.js:584
projectmanagerApp |     throw err;
projectmanagerApp |     ^
projectmanagerApp | 
projectmanagerApp | Error: Cannot find module '/var/app/server.js'
projectmanagerApp |     at Function.Module._resolveFilename (internal/modules/cjs/loader.js:582:15)
projectmanagerApp |     at Function.Module._load (internal/modules/cjs/loader.js:508:25)
projectmanagerApp |     at Function.Module.runMain (internal/modules/cjs/loader.js:754:12)
projectmanagerApp |     at startup (internal/bootstrap/node.js:283:19)
projectmanagerApp |     at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
projectmanagerApp | npm ERR! code ELIFECYCLE
projectmanagerApp | npm ERR! errno 1
projectmanagerApp | npm ERR! projectmanager-app@0.0.1 serve: `node server.js`
projectmanagerApp | npm ERR! Exit status 1
projectmanagerApp | npm ERR! 
projectmanagerApp | npm ERR! Failed at the projectmanager-app@0.0.1 serve script.
projectmanagerApp | npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
projectmanagerApp | 
projectmanagerApp | npm ERR! A complete log of this run can be found in:
projectmanagerApp | npm ERR!     /root/.npm/_logs/2019-03-11T19_23_58_394Z-debug.log

Short version: cmd node server.js is executed for no reason at all, even though I have specified in the dockerfile the CMD [ "npm", "run", "serve" ]

Thank you for any support or suggestions what I might have done wrong in advance.

Oh wow, right when I posted this thread, after 3 hours of headaches, it blinked to me that I might havnen’t ran the docker-compose build command.
I really hope that if anyone else ever gets into stuff like me finds this thread and reads this reply.