How to use the image between steps in bitbucket-pipelines - php

Question

I would be grateful if someone could help me with setting up bitbucket-pipeline for my php env. What I'm trying to succeed is:
Build image in the first step
In the second step run some QA stuff like unit test, code sniffer etc.
Deploy to preprod envirement
Currently I'm stuck with re-using image from the first step. This is how my bitbucket-pipelines.yml looks like:
pipelines:
branches:
develop:
- step:
name: Build docker image
caches:
- composer
script:
- apt-get update && apt-get install -y unzip
- docker-php-ext-install mysqli pdo_mysql json sockets
- curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
- composer install
- parallel:
- step:
caches:
- composer
name: Unit tests
script:
- vendor/bin/phpunit
- step:
caches:
- composer
name: Code sniffer
script:
- composer phpcs:all
- step:
name: Deploy to preprod
script:
- echo "Deployment"
What I get here is:
bash: vendor/bin/phpunit: No such file or directory - from "Unit tests" step
and bash: composer: command not found - from "Code sniffer" step
I already tried to set docker/composer to cache, save image in the first step and import it in the second, but still not working.

Answer 1

One way to share stuff between different steps is to make use of Artifacts.
Basically, bitbucket spins up each step in a separate docker container. So a way to re-use material between steps is create an artifact.
The link should give you enough information.
For example:
- step: &build
caches:
- node
name: Build
script:
- npm install
- npm run build
artifacts: # defining the artifacts to be passed to each future step.
- dist/**
- step: &read-from-artifact
name: Read from the artifact saved in the previous step
script:
- echo "Read artifact (dist folder) saved in previous step"
- ls -la dist/