HOW_TO_BUILD_NEW_IMAGE.md

How to build new image

Steps

1. Update following middlewares on Dockerfile to the latest

middleware	check point	release information URL
base image	FROM	wordpress - Docker Hub (Choose the most detailed tag because it doesn't move)
Composer	RUN sh -c 'wget ...	How do I install Composer programmatically? - Composer
PHPUnit	phpunit/phpunit	Plugin Unit Tests – WP-CLI — WordPress.org
install-wp-tests	RUN wget -O /usr/bin/install-wp-tests ...	Releases · wp-cli/scaffold-command

2. Run test on local

docker-compose -f docker-compose.test.yml run sut

3. Commit

4. Create Pull Request

5. Merge Pull Request

6. Push with tag same with base image on latest revision of master branch

EX:

git tag 5.3.1-php7.3-apache
git push origin 5.3.1-php7.3-apache

Then, new image will automatically built.

Roadmap

I'm planing to automate updating Dockerfile, committing it, and pushing with tag by GitHub Actions. Because Docker Hub prepares link to revision of GitHub repository for referencing Dockerfile and build context. And Docker hub has not support build args yet.

Feature request: Build args on docker hub · Issue #508 · docker/hub-feedback