Make platform.sh Deploy hook idempotent

.platform.app.yaml

# This is an adaptation and simplication from the Platform.sh Drupal 10 templates:
# https://github.com/platformsh-templates/drupal10/blob/master/.platform.app.yaml
# https://github.com/platformsh-templates/drupal10/blob/master/drush/platformsh_deploy_drupal.sh

mounts:
    # Create a persistent filesystem location to house the PREVIOUS_PLATFORM_TREE_ID
    # value in a file that must be available for each build. 
    '/build_info':
        source: local
        source_path: 'build_info'

hooks:
    # Make the deploy hook idempotent. Only run `config:import` if we're certain the
    # deployment is part of a code release. Note: this hook can run even when code
    # changes are not deployed, despite being documented otherwise in Platform Docs,
    # leading to production data loss if configurations are changed manually via
    # Drupal's UI before it has had a chance to be captured and exported to code.
    deploy: |
        set -e
        cd /app/web
        logger "[deploy]: Code deployed to $PLATFORM_BRANCH."
        logger "[deploy]: Updating database."
        drush -y updatedb --uri=platform.sh
        PREVIOUS_PLATFORM_TREE_ID=$(</app/build_info/PREVIOUS_PLATFORM_TREE_ID)
        logger "[deploy]: Previous ID: $PREVIOUS_PLATFORM_TREE_ID"
        logger "[deploy]: Current ID: $PLATFORM_TREE_ID"
        if [ "$PLATFORM_TREE_ID" != "$PREVIOUS_PLATFORM_TREE_ID" ]; then
            logger "[deploy]: Code changes detected. Importing configuration."
            drush -y config:import --uri=platform.sh
        else
            logger "[deploy]: No code changes detected. Skipping config import to prevent data loss."
            drush config:status
            drush config:export --no --diff || true
        fi
        logger "[deploy]: Clearing cache."
        drush cache:rebuild --uri=platform.sh
        echo "$PLATFORM_TREE_ID" > /app/build_info/PREVIOUS_PLATFORM_TREE_ID