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composer require laravel/helpers

Illuminate\Contracts\Container\BindingResolutionException  : Target [Spatie\Backup\Tasks\Cleanup\CleanupStrategy] is not instantiable while building [Spatie\Backup\Commands\CleanupCommand].

php artisan cache:clear
php artisan config:clear
composer require spatie/laravel-backup
php artisan optimize

root@e797291ab0d3:/var/www/laravel-blog# php artisan backup:run --only-db
Starting backup...
Dumping database laravel-blog...
Backup failed because The dump process failed with exitcode 127 : Command not found : sh: 1: mysqldump: not found

open up your workspace/Dockerfile and add these lines to it

#
#--------------------------------------------------------------------------
# mysql-client
#--------------------------------------------------------------------------
#

USER root

RUN apt update && \
    apt install -y mysql-client
down your containers
docker-compose down
then rebuild workspace just by
docker-compose build workspace
and re-up you containers for example
docker-compose up redis nginx mysql

app()['cache']->forget('spatie.permission.cache');