As of 1.4.0, the hostname of the executor should be executor rather than
appwrite-executor. The problem is our install command always uses the
existing installation's variable values as the default for the upgrade.
This means the _APP_EXECUTOR_HOST will retain it's old value.
This PR Adds an overwrite key to variables.php to allow overwriting the
variable value regardless of whatever was in the previous installation.
When a previous installation is found during installation/upgrade, the
user is prompted to confirm whether they want to overwrite it. We
originally only accepted 'Y', but this PR changes it to accept 'y' as
well to reduce friction.
By not specifying a docker-compose.yml file, docker compose
automatically uses the docker-compose.yml file in the project directory
and a docker-compose.override.yml file if one is present.
