WordPress docker copy theme into exposed folder

Im trying to build wordpress theme with docker & docker-compose. The problem that Im having is that Im trying to copy my theme into exposed wp-content folder of docker but for some reason it says there is not such file or directory.

Runing ls command my folder structure looks like this:

wp-content // available only after docker compose finishes
theme
dockerFile
docker-compose.yaml

Here is how my docker-compose.yaml file looks like

version: '3'

services:
  # Database
  db:
    image: mysql:5.7
    volumes:
      - db_data:/var/lib/mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress
    networks:
      - wpsite
  # phpmyadmin
  phpmyadmin:
    depends_on:
      - db
    image: phpmyadmin/phpmyadmin
    restart: always
    ports:
      - '8080:80'
    environment:
      PMA_HOST: db
      MYSQL_ROOT_PASSWORD: password 
    networks:
      - wpsite
  # WordPress
  wordpress:
    build: .
    depends_on:
      - db
    ports:
      - '8000:80'
    restart: always
    volumes:
      - ./wp-content/:/var/www/html/wp-content
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress
    networks:
      - wpsite
networks:
  wpsite:
volumes:
  db_data:

And here how my DockerFile looks like

FROM wordpress:latest
RUN echo "Install wordpress"
COPY ./giveaway_theme ./wp-content/themes
RUN echo "Copy theme to wp-content folder"

Looks like im somehow inside container, because when I run ls command it shows nothing,
So my question is is there any way that I can copy theme into wp-content folder after docker compose finishes ??

Source: StackOverflow