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Enable kaniko custom build context

Achref BEN SAAD requested to merge achref.bensaad/gitlab:feat/add_kaniko_context_dir_selection_option_in_kaniko_build_job into master

What does this MR do and why?

Enabled kaniko custom build context and special build cases.

  • Some projects hosts their Dockerfile in non standard location such as $CI_PROJECT_DIR/deploy
  • Some projects dynamically generate their Dockerfile such as dotnet.

This change will not break pre-existent jobs.

If the user set the $BUILD_DIR variable in the .gitlab-ci.yml kaniko will use it as its build context Kaniko context

If the Dockerfile is generated in a previous job and its passed to this job via artifacts, the user should set the variable $GENERATED_DOCKERFILE with any value to ensure that this job execute.

The two functionalities can work side by side.

How to set up and validate locally

  • To validate the custom docker file location functionality:

1- Move your Dockerfile to a sub directory in your repository

2- Set the BUILD_DIR in the .gitlab-ci.yml variables to be the new location of your Dockerfile

3- Build and deploy your application

  • To validate the cross job Dockerfile building

1- Create a job A that generates a Dockerfile and pass it as an artifact

2- Include this job in the include section of .gitlab-ci.yml and override it with a dependency to job A

kaniko-build:
  stage: build
  dependencies:
    - A

3- Set the GENERATED_DOCKERFILE variable with any value

4- Build and deploy your application

5- Merge this request 😅

Edited by Achref BEN SAAD

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