How can I run Uvicorn in ECS?

I have a FastAPI/Uvicorn/SQLAlchemy app that I'm trying to run in ECS. I have successfully run the app via docker compose, but when I try to deploy the container in ecs I get the following error:

executable file not found in $PATH:

I am trying to run this command:

bash -c alembic -c alembic.ini upgrade head && gunicorn --bind 0.0.0.0:8000 -k uvicorn.workers.UvicornWorker src.backend_service.main:app

I have tried this via the "command" section of the ECS UI.

My Dockerfile looks like this:

# NOTE: this image has to be built from the root directory since it contains files and folders from there
# docker build -t backend_service .

# Pull base image
FROM --platform=linux/amd64 python:3.10.11-slim-buster

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

WORKDIR /code/

# Install dependencies
COPY ./src/backend_service/requirements_backend_service.txt requirements_backend_service.txt
RUN pip3 install -r requirements_backend_service.txt

COPY ./src/backend_service /code/src/backend_service/
COPY ./db_alembic /code/db_alembic
COPY ./alembic.ini /code/alembic.ini


ENV PATH="/code/venv/bin:$PATH"
ENV PATH="/code:$PATH"

ENV PYTHONPATH=/code

EXPOSE 8000

And my Docker Compose file looks like this:

backend_service:
    platform: linux/amd64
    environment:
      ENV: dev
    image: backend_service:latest
    build:
      dockerfile: ./Dockerfile.backend
    command: bash -c "alembic -c alembic.ini upgrade head && gunicorn --bind 0.0.0.0:8000 -k uvicorn.workers.UvicornWorker src.backend_service.main:app"
    volumes:
        - ./src/backend_service:/code/src/backend_service
    ports:
      - "8000:8000"

My ecs task definition looks like this:

{
    "taskDefinitionArn": "arn:aws:ecs:XXXXXXXXX:task-definition/run_backend_service_manual:3",
    "containerDefinitions": [
        {
            "name": "backend_service",
            "image": "XXXXXXXXX/ecr-repository-dev-v1:backend_service_latest",
            "cpu": 0,
            "portMappings": [
                {
                    "name": "backend_service-8000-tcp",
                    "containerPort": 8000,
                    "hostPort": 8000,
                    "protocol": "tcp",
                    "appProtocol": "http"
                }
            ],
            "essential": true,
            "command": [
                "bash -c alembic -c alembic.ini upgrade head && gunicorn --bind 0.0.0.0:8000 -k uvicorn.workers.UvicornWorker src.backend_service.main:app"
            ],
            "environment": [],
            "environmentFiles": [],
            "mountPoints": [],
            "volumesFrom": [],
            "workingDirectory": "/code/",
            "ulimits": [],
            "logConfiguration": {
                "logDriver": "awslogs",
                "options": {
                    "awslogs-group": "/ecs/run_backend_service_manual",
                    "mode": "non-blocking",
                    "awslogs-create-group": "true",
                    "max-buffer-size": "25m",
                    "awslogs-region": "eu-central-1",
                    "awslogs-stream-prefix": "ecs"
                },
                "secretOptions": []
            },
            "systemControls": []
        }
    ],
    "family": "run_backend_service_manual",
    "taskRoleArn": "arn:aws:iam::XXXXXXXXX:role/dev-ecs-execution-v1",
    "executionRoleArn": "arn:aws:iam::XXXXXXXXX:role/dev-ecs-execution-v1",
    "networkMode": "awsvpc",
    "revision": 3,
    "volumes": [],
    "status": "ACTIVE",
    "requiresAttributes": [
        {
            "name": "com.amazonaws.ecs.capability.logging-driver.awslogs"
        },
        {
            "name": "ecs.capability.execution-role-awslogs"
        },
        {
            "name": "com.amazonaws.ecs.capability.ecr-auth"
        },
        {
            "name": "com.amazonaws.ecs.capability.docker-remote-api.1.19"
        },
        {
            "name": "com.amazonaws.ecs.capability.docker-remote-api.1.17"
        },
        {
            "name": "com.amazonaws.ecs.capability.docker-remote-api.1.28"
        },
        {
            "name": "com.amazonaws.ecs.capability.task-iam-role"
        },
        {
            "name": "ecs.capability.execution-role-ecr-pull"
        },
        {
            "name": "com.amazonaws.ecs.capability.docker-remote-api.1.18"
        },
        {
            "name": "ecs.capability.task-eni"
        },
        {
            "name": "com.amazonaws.ecs.capability.docker-remote-api.1.29"
        }
    ],
    "placementConstraints": [],
    "compatibilities": [
        "EC2",
        "FARGATE"
    ],
    "requiresCompatibilities": [
        "FARGATE"
    ],
    "cpu": "1024",
    "memory": "2048",
    "runtimePlatform": {
        "cpuArchitecture": "X86_64",
        "operatingSystemFamily": "LINUX"
    },
    "registeredAt": "2024-12-31T19:56:03.600Z",
    "registeredBy": "arn:aws:iam::XXXXXXXXX:root",
    "enableFaultInjection": false,
    "tags": []
}

I think this might have something to do with how I'm passing the command because it works via Docker Compose. I have tried the docker run documentation and have tried putting the parameters in a list (["paramq1", "param2"]) but I keep getting the same error.

What might I be doing wrong?