Fix docker-compose file to deploy server image properly

[ntedgi]

there is an issue with the docker-compose file image of playground server
when running docker-compose up

#6 0.818 npm ERR! enoent ENOENT: no such file or directory, open '/home/app/package.json'

❯ docker-compose up
[+] Building 7.4s (6/6) FINISHED
 => [internal] load build definition from Dockerfile             0.0s
 => => transferring dockerfile: 32B                              0.0s
 => [internal] load .dockerignore                                0.0s
 => => transferring context: 2B                                  0.0s
 => [internal] load metadata for docker.io/library/node:14.16.1  6.2s
 => [1/3] FROM docker.io/library/node:14.16.1-buster@sha256:09d  0.0s
 => CACHED [2/3] WORKDIR /home/app                               0.0s
 => ERROR [3/3] RUN rm -rf node_modules     && npm ci --quiet -  0.9s
------
 > [3/3] RUN rm -rf node_modules     && npm ci --quiet --no-progress:
#6 0.800 npm ERR! code ENOENT
#6 0.805 npm ERR! syscall open
#6 0.809 npm ERR! path /home/app/package.json
#6 0.812 npm ERR! errno -2
#6 0.818 npm ERR! enoent ENOENT: no such file or directory, open '/home/app/package.json'
#6 0.819 npm ERR! enoent This is related to npm not being able to find a file.
#6 0.821 npm ERR! enoent
#6 0.833
#6 0.833 npm ERR! A complete log of this run can be found in:
#6 0.834 npm ERR!     /root/.npm/_logs/2022-04-15T15_23_16_787Z-debug.log
------
failed to solve: rpc error: code = Unknown desc = executor failed running [/bin/sh -c rm -rf node_modules     && npm ci --quiet --no-progress]: exit code: 254

to solve this issue add to file /playground/server/Dockerfile
COPY . .line
after
WORKDIR /home/app