Error running sh script with openjdk:11 and gradle:6.5 containers

[Nicanor Bondarenco]

I have a Spring Boot Kotlin Gradle project, and I'm trying to run a pipeline to build my project using docker-compose to run my CI tests, but I'm not able because docker-compose does not exists

So, following several posts on internet, I created a dependencies.sh file to run before gradle, that will install docker-compose for my tests, but I'm getting the error

./dependencies.sh: 6: ./dependencies.sh: apk: not found

Can someone help me create a bitbucket-pipelines.yml with docker-compose for my tests, so far what I got is:

bitbucket-pipelines.yml file

image: openjdk:11

definitions:
  caches:
    gradleall: ~/.gradle
  services:
    docker:
      memory: 2048
  steps:
    - step: &Build
        name: Build and Test
        artifacts:
          - build/libs/**
          - build/reports/**
        script:
          - chmod +x dependencies.sh
          - ./dependencies.sh
          - bash ./gradlew clean build --stacktrace
        services:
          - docker

pipelines:
  default:
    - step: *Build

and dependencies.sh file

#!/usr/bin/env sh

set -eu

# Add python pip and bash
apk add --no-cache py-pip bash

# Install docker-compose via pip
pip install --no-cache-dir docker-compose
docker-compose -v

The error is: