CI / CD Salesforce - Bitbucket ENVIRONMENT variables issues in pipelines

I am trying to setup it CI/CD for salesforce using bitbucket.

I have create a connected app for each environments (qa, uat, production)

And in bitbucket > repository settings > deployments:

I have added the sandboxes for staging environment and the production environment. For each environment I have set ENVIRONMENT variables:

USERNAME
CONSUMER_KEY
LOGIN_URL
ENVIRONMENT

Like this:

but when I push a commit to test the deployment, the ENVIRONMENT variable returns an error.

ENVIRONMENT variable is not set

I use echo in the script to be able to log the error and $ENVIRONMENT is empty.

set -e
# echo is used to print the message on the console
echo "Starting the build process for environment: $ENVIRONMENT"

if [ -z "$ENVIRONMENT" ]; then
    echo "ENVIRONMENT variable is not set."
    exit 1
fi

Currently the build fails here when I have clearly created the ENVIRONMENT variable:

finally these are the deployment steps in the bitbucket-pipelines.yml:

# Production deployment
release/master:
  - step: *build-pipeline
  - step: *destructive-pre
  - step: *deploy-full-package
  - step: *deploy-env-spec-config
  - step: *destructive-post

I also tried adding deployment to the steps as shown below:

# Production deployment
release/master:
 deployment: production
 steps:
  - step: *build-pipeline
  - step: *destructive-pre
  - step: *deploy-full-package
  - step: *deploy-env-spec-config
  - step: *destructive-post

But when doing so, another error occurs:

There is an error in your bitbucket-pipelines.yml at [pipelines > branches > release/master > deployment]. This section should not contain "deployment".

How can I fix these errors?

Thanks