FLOWER_BASIC_AUTH variable in docker compose doesn't work

I am trying to use FLOWER_BASIC_AUTH variable as per the documentation in the docker compose file.

  flower:
    container_name: airflow-flower
    environment:
      FLOWER_BASIC_AUTH: "foo:bar"
    command: celery flower

The container is crashing and keeps restarting. The only logs I have are the following:

/home/airflow/.local/lib/python3.8/site-packages/airflow/models/base.py:49 MovedIn20Warning: Deprecated API features detected! These feature(s) are not compatible with SQLAlchemy 2.0. To prevent incompatible upgrades prior to updating applications, ensure requirements files are pinned to "sqlalchemy<2.0". Set environment variable SQLALCHEMY_WARN_20=1 to show all deprecation warnings.  Set environment variable SQLALCHEMY_SILENCE_UBER_WARNING=1 to silence this message. (Background on SQLAlchemy 2.0 at: https://sqlalche.me/e/b8d9)

airflow command error: argument GROUP_OR_COMMAND: celery subcommand works only with CeleryExecutor, CeleryKubernetesExecutor and executors derived from them, your current executor: SequentialExecutor, subclassed from: BaseExecutor, see help above.
usage: airflow [-h] GROUP_OR_COMMAND ...

positional arguments:
  GROUP_OR_COMMAND

    Groups:
      celery         Celery components
      config         View configuration
      connections    Manage connections
      dags           Manage DAGs
      db             Database operations
      jobs           Manage jobs
      kubernetes     Tools to help run the KubernetesExecutor
      pools          Manage pools
      providers      Display providers
      roles          Manage roles
      tasks          Manage tasks
      users          Manage users
      variables      Manage variables

    Commands:
      cheat-sheet    Display cheat sheet
      dag-processor  Start a standalone Dag Processor instance
      info           Show information about current Airflow and environment
      kerberos       Start a kerberos ticket renewer
      plugins        Dump information about loaded plugins
      rotate-fernet-key
                     Rotate encrypted connection credentials and variables
      scheduler      Start a scheduler instance
      standalone     Run an all-in-one copy of Airflow
      sync-perm      Update permissions for existing roles and optionally DAGs
      triggerer      Start a triggerer instance
      version        Show the version
      webserver      Start a Airflow webserver instance

optional arguments:
  -h, --help         show this help message and exit

Expected behavior I would expect this variable to work so I can have the username and password in a different environment file and not use --basic-auth=foo:bar in the command for stating the container.

mher / flower

FLOWER_BASIC_AUTH variable in docker compose doesn't work #1318