Getting "The serve command requires to be run in an Angular project, but a project definition could not be found" running Docker Compose

Firstly, I inform you that i'm currently student in software development. So I beg for your tolerance regards to my question :)

I have a problem trying to up my docker-compose services. It is 3 services docker-compose.yml: Java Backend, Angular 7 Frontend, Postgres DB.

[EDIT]: the solution has been found by Wassim. I had to change volumes in the service ct-front FROM:

volumes:
    - '.:/app'

TO

volumes:
    - 'contacts-front:/app'

THEN add contacts-front: to my volumes declaration.

volumes:
    db_data:
    contacts-front:

The Back and the DB run fine. But the Angular app doesn't work. I get an error pretty famous:

cont-ct-front | The serve command requires to be run in an Angular project, but a project definition could not be found.

If I run "ng v" in my Angular app, I get the following output:

Angular CLI: 7.3.7
Node: 12.9.0
OS: win32 x64
Angular: 7.2.11
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.13.7
@angular-devkit/build-angular     0.13.7
@angular-devkit/build-optimizer   0.13.7
@angular-devkit/build-webpack     0.13.7
@angular-devkit/core              7.3.7
@angular-devkit/schematics        7.3.7
@angular/cdk                      7.3.6
@angular/cli                      7.3.7
@angular/material                 7.3.6
@ngtools/webpack                  7.3.7
@schematics/angular               7.3.7
@schematics/update                0.13.7
rxjs                              6.3.3
typescript                        3.2.4
webpack                           4.29.0

Of course, I tried the solution I found on google which is to run

ng update @angular/cli --migrate-only --from=<angular-cli version>

But The error stays.

Here are my docker config files.

docker-compose.yml

version: '3.7'

services:
    ct-db:
        build:
            context: .
            dockerfile: Dockerfile-db
        container_name: cont-ct-db
        restart: unless-stopped
        ports:
            - 5432:5432
        expose:
            - 5432
        environment:
            POSTGRES_USER: admin_ct
            POSTGRES_PASSWORD: 123
            POSTGRES_DB: db_contacts
        volumes:
          - db_data:/var/lib/postgres/data
        networks:
            - ct-network

    ct-back:
        depends_on:
            - ct-db
        build:
            context: .
            dockerfile: Dockerfile-back
        container_name: cont-ct-back
        ports:
            - 8080:8080
        expose:
            - 8080
        environment:
            SPRING_DATASOURCE_USERNAME: admin_ct
            SPRING_DATASOURCE_PASSWORD: 123
            SPRING_DATASOURCE_URL: jdbc:postgresql://ct-db:5432/db_contacts
        networks:
            - ct-network

    ct-front:
        build: 
            context: .
            dockerfile: contacts-front/Dockerfile-front
        container_name: cont-ct-front
        volumes:
            - '.:/app'
            - '/app/node_modules'
        ports:
            - 4200:4200
        networks:
            - ct-network

networks:
    ct-network:

volumes:
    db_data:

Dockerfile-back

FROM openjdk:8
ADD contacts-back/contacts-back.jar contacts-back.jar
ENTRYPOINT ["java", "-jar", "contacts-back.jar"]

Dockerfile-front

# base image
FROM node:latest

# install chrome for protractor tests
RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
RUN sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'
RUN apt-get update && apt-get install -yq google-chrome-stable

# set working directory
WORKDIR /app

# add `/app/node_modules/.bin` to $PATH
ENV PATH /app/node_modules/.bin:$PATH

# install and cache app dependencies
COPY contacts-front/package.json /app/package.json
RUN npm install
RUN npm install -g @angular/cli@7.3.7

# add app
COPY contacts-front/. /app

# start app
CMD ng serve --host 0.0.0.0

Dockerfile-db

FROM postgres:latest
COPY db/db_data.sql /docker-entrypoint-initdb.d/init.sql
COPY db/db_insert.sql /opt/db_insert.sql
COPY sh/backup-db.sh /opt/backup-db.sh
RUN apt-get update \
&& apt-get install vim -y \
&& export EDITOR=/usr/bin/vim \
&& chmod +x /opt/backup-db.sh \

My directory tree is:

contacts-back       --> directory containing the JAR file
contacts-front      --> directory containing the Angular application
db                  --> directory containing the SQL scripts
sh                  --> directory containing the SH scripts
docker-compose.yml
Dockerfile-back 
Dockerfile-db

Important point: the Angular app works fine if I put all docker config files and scripts in the Angular app directory (contacts-front). But this would be really ugly, right?

Does anyone sees what I'm doing wrong?

As usual, thanks a lot for your help! :)