I am doing a project where there is a benthos script that insert some data into a cassandra db, but during the execution, with a function, benthos call a python script , that create and populate the cassandra database.
I am trying building with docker:

• i need to install python and Benthos
• i need to install the python library for cassandra
• like cmd , to start the benthos script

docker-compose that create 3 different service:

• one for the db
• one for the Python script
• one for the Benthos script

dockerfile

FROM ubuntu:latest

WORKDIR /home

RUN apt-get update && apt-get upgrade -y &&   
    apt-get install -y python3 python3-pip python3-venv curl unzip && 
    apt-get clean

RUN python3 -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

RUN pip install --upgrade pip
RUN pip install cassandra-driver

RUN curl -LO https://github.com/redpanda-data/redpanda/releases/latest/download/rpk-linux-amd64.zip && 
    mkdir -p ~/.local/bin && 
    unzip rpk-linux-amd64.zip -d ~/.local/bin/ && 
    rm rpk-linux-amd64.zip

ENV PATH="~/.local/bin:$PATH"

COPY ./src /home

USER 1000

CMD ["benthos", "-c", "/home/main.yaml"]

I install benthos like this ,because the official tutorial say to do this.
Benthos instalation guide
I didn’t find other method to install this “language”

Docker-compose

services:
  benthos:
    image: benthos-study
    build:
     context: .
     dockerfile: ./Dockerfile  
    ports:
      - 8010:4195
    volumes:
      - ./src:/home/src/
    container_name: benthos-container
    stdin_open: true
    tty: true
    depends_on:
      database:
        condition: service_healthy
        
  app:
    build: 
      context: .
      dockerfile: ./Dockerfile
    volumes:
      - ./src:/home/src/
    container_name: python-container
    depends_on:
      database:
        condition: service_healthy

  database:
    image: cassandra:latest
    ports:
      - 9042:9042
    container_name: cassandra-container
    healthcheck:
      test: ["CMD-SHELL", "cqlsh -u cassandra -p cassandra -e 'DESCRIBE KEYSPACES'"]
      interval: 30s
      timeout: 10s
      retries: 5

The cassandra-container start with no error , when it finish to build up the service , start the benthos one, but it give me immediatly an error

Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: "benthos": executable file not found in $PATH: unknown

And i don’t know how to resolve it , because it seems that he can’t find benthos, but i follow the exact thing that are writes on the officail guide.

Looking on internet, documentation and on stackoverflow . I didn’t find nothing that could help me to resolve this type of problem.

I expect someone can give me some advice to resolve it.