Setting up CI/CD on Gitlab for django project - django

Question

This is the first time I've tried adding CI/CD for a Django project on gitlab. I want to set up automatic testing and deploying to the server in the development branch if it is successful.
With tests almost everything worked out, dependencies are installed and started python manage.py test but the problem with the testing database. The traceback error is a bit lower and here I don't quite understand how the interaction with the database happens during the tests.
Creating test database for alias 'default'...
.....
MySQLdb._exceptions.OperationalError: (2002, "Can't connect to MySQL server on '127.0.0.1' (115)")
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 21, in <module>
main()
File "manage.py", line 17, in main
...
super(Connection, self).__init__(*args, **kwargs2)
django.db.utils.OperationalError: (2002, "Can't connect to MySQL server on '127.0.0.1' (115)")
In the settings of django settings.py, a connector to the database is obtained through such variables in a .env file.
.env
SECRET_KEY=ja-t8ihm#h68rtytii5vw67*o8=o)=tmojpov)9)^$h%9#16v&
DEBUG=True
DB_NAME=db_name
DB_USER=username
DB_PASSWORD=dbpass
DB_HOST=127.0.0.1
And with the deployment of the project, everything is not clear yet. I'd appreciate your help setting it up.
gitlab-ci.yml
stages:
- test
- deploy
test:
stage: test
script:
- apt update -qy
- apt install python3 python3-pip virtualenvwrapper -qy
- virtualenv --python=python3 venv/
- source venv/bin/activate
- pip install -r requirements.txt
- python manage.py test
stage: deploy
script:
...
???
only:
- develop
UPD
Accordingly Ruddra recommendation I added to yml file next line:
services:
- mysql
variables:
# Configure mysql service (https://hub.docker.com/_/mysql/)
MYSQL_DATABASE: test
MYSQL_ROOT_PASSWORD: mysql
connect:
image: mysql
script:
- echo "SELECT 'OK';" | mysql --user=root --password="$MYSQL_ROOT_PASSWORD" --host=mysql "$MYSQL_DATABASE"
And as a result I got connect successful status and test error
status with the same traceback as a starting question

Answer 1

Actually you can run MySQL as service in GitLab. For example:
services:
- mysql:latest
variables:
# Configure mysql environment variables (https://hub.docker.com/_/mysql/)
MYSQL_DATABASE: "db_name"
MYSQL_ROOT_PASSWORD: "dbpass"
MYSQL_USER: "username"
MYSQL_PASSWORD: "dbpass"
Update: In your .env file, update the following settings:
DB_HOST=mysql
Update 2: (Based on this issue on GitLab) You can update the code like this:
variables:
MYSQL_DATABASE: "db_name"
MYSQL_ROOT_PASSWORD: "dbpass"
MYSQL_USER: "username"
MYSQL_PASSWORD: "dbpass"
test:
script:
- apt update -qy
- mysql --user=$MYSQL_USER --password=$MYSQL_PASSWORD --database=$MYSQL_DATABASE --host=$MYSQL_HOST --execute="SHOW DATABASES; ALTER USER '$MYSQL_USER'#'%' IDENTIFIED WITH mysql_native_password BY '$MYSQL_PASSWORD'"