Jenkins agent container is failing to init:

I have the following docker compose configuration:

version: '3.3'
services:
  jenkins:
    image: jenkins-ansible
    build: ansible
    restart: on-failure
    privileged: true
    user: root
    ports:
      - 8080:8080
      - 5000:5000
    container_name: jenkins
    volumes:
      - /home/juliano/workspace/docker-projects/jenkins/volume/:/var/jenkins_home
      - /var/run/docker.sock:/var/run/docker.sock
      - /usr/local/bin/docker:/usr/local/bin/docker
  jenkins-agent-1:
    build:
      context: jenkins-agent
    restart: on-failure
    expose:
      - "22"
    container_name: jenkins-agent-1
    environment:
      - JENKINS_AGENT_SSH_PUBKEY=ssh-rsa omitted
      - JAVA_HOME=/opt/java/openjdk/bin/java
    depends_on:
      - jenkins
    volumes:
      - /home/juliano/workspace/docker-projects/jenkins/volume/:/var/jenkins_home
  jenkins-agent-2:
    # image: jenkins/ssh-agent:jdk11
    build:
      context: jenkins-agent
    restart: on-failure
    expose:
      - "22"
    container_name: jenkins-agent-2
    environment:
      - JENKINS_AGENT_SSH_PUBKEY=ssh-rsa omitted
      - JAVA_HOME=/opt/java/openjdk/bin/java
    depends_on:
      - jenkins
    volumes:
      - /home/juliano/workspace/docker-projects/jenkins/volume/:/var/jenkins_home
  remote_host:
    container_name: remote-host
    image: remote-host
    build:
      context: ubuntu18.04

And I'm receiving the following error message:

+ env
+ [[ ssh-rsa omitted == ssh-* ]]
+ write_key 'ssh-rsa omitted'
+ local ID_GROUP
++ stat -c %U:%G /home/jenkins
+ ID_GROUP=jenkins:jenkins
+ mkdir -p /home/jenkins/.ssh
+ echo 'ssh-rsa omitted'
+ chown -Rf jenkins:jenkins /home/jenkins/.ssh
+ chmod 0700 -R /home/jenkins/.ssh
+ [[ '' == ssh-* ]]
+ env
+ grep _
/usr/local/bin/setup-sshd: line 54: /etc/environment: Permission denied

The jenkins-agent dockerfile is:

FROM jenkins/ssh-agent

USER root

RUN apt-get update && apt-get install python3 -y
RUN apt-get install curl -y
RUN apt-get install python3-distutils -y
RUN curl -O https://bootstrap.pypa.io/get-pip.py && \
    python3 get-pip.py && \
    pip install ansible --upgrade

USER jenkins

Previously, I was using jenkins/ssh-agent:jdk11 to build the agents and it was working well. Then I unsuccessfully tried to install Ansible into the agents through the jenkins-agent Dockerfile (receiving the aforementioned error). Now, even if I change jenkins-agent to jenkins/ssh-agent:jdk11, it is incurring the same problem.

Anyone could kindly help me, please?