Github Actions Application is being build twice - docker

Question

I have a problem. I am starting to work with Github Actions, and I got a working pipeline where I am trying to:
Build the docker application
Run the tests
Publish to docker repository
But the test running and publishing are 2 separate jobs, so I am building the image twice. Here is the workflow code:
name: Test & Publish Docker Image
on:
push:
branches: [ master ]
pull_request:
branches: [ master ]
jobs:
run_application_tests:
name: Run test suite
runs-on: ubuntu-latest
env:
COMPOSE_FILE: docker-compose.yml
DOCKER_USER: ${{ secrets.DOCKER_USER }}
DOCKER_PASS: ${{ secrets.DOCKER_PASS }}
steps:
- name: Checkout code
uses: actions/checkout#v3
- name: Login To Docker Hub
uses: docker/login-action#v2
with:
username: ${{ secrets.DOCKER_USERNAME }}
password: ${{ secrets.DOCKER_PASSWORD }}
- name: Build and run docker image
run: docker-compose up -d --build
- name: Run migrations
run: make migrate
- name: Run tests
run: make test
build_and_publish_docker_image:
needs: run_application_tests
name: Build & Publish Docker Images
runs-on: ubuntu-latest
steps:
- name: Checkout The Repo
uses: actions/checkout#v3
- name: Login To Docker Hub
uses: docker/login-action#v2
with:
username: ${{ secrets.DOCKER_USERNAME }}
password: ${{ secrets.DOCKER_PASSWORD }}
- name: Build & Push Docker Image
uses: docker/build-push-action#v3
with:
push: true
tags: |
me/image:latest
me/image:${{ github.sha }}
The docker image is a Ruby-On-Rails application so the bundle install takes very long. Each build takes about 2-3 minutes.
I also tried adding:
cache-from: type=gha
cache-to: type=gha,mode=max
To the docker/build-push-action#v3, but that resulted in:
Error: buildx failed with: ERROR: cache export feature is currently not supported for docker driver. Please switch to a different driver (eg. "docker buildx create --use")
What can I change to improve this pipeline time based?

Answer 1

in your job run_application_tests you have this code:
- name: Login To Docker Hub
uses: docker/login-action#v2
with:
username: ${{ secrets.DOCKER_USERNAME }}
password: ${{ secrets.DOCKER_PASSWORD }}
- name: Build and run docker image
run: docker-compose up -d --build
this code runs docker-compose why?
this is how your code should be if you want to run tests only:
jobs:
run_application_tests:
name: Run test suite
runs-on: ubuntu-latest
steps:
- name: Checkout code
uses: actions/checkout#v3
- name: Run migrations
run: make migrate
- name: Run tests
run: make test