[RFC PATCH v2 00/11] gitlab-ci: Allow forks to select & restrict build jobs

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Hi,

2 months ago GitLab added time limit to their free CI offer [1].
This series provide developers with the possibility to not run
all jobs. By default all jobs are started, but we can restrict
by selecting a subset of them.

Since v1:
- switch from "all but skip some" to "all or select some"

I tried to use a project-wide environment variable [2] to set
the default set of selected features a fork is interested in,
but it didn't work out well yet.

A friendly way to use this feature is with git aliases [3]:

 $ git config alias.pushci_system \
    'push -o ci.variable="QEMU_BUILD=system"'
 $ git config alias.pushci_debian \
    'push -o ci.variable="QEMU_BUILD=debian"'

Then you can run the jobs based on Debian images (only) using:

 $ git pushci_debian gitlab_repo my_branch_for_debian

Or run all system-mode emulation jobs only using:

  $ git pushci_system my_gitlab_repo branch_with_system_feature

Comments welcomed!

Regards,

Phil.

[1] https://about.gitlab.com/releases/2020/09/01/ci-minutes-update-free-users/
[2] https://docs.gitlab.com/ee/ci/variables/README.html#create-a-custom-variable-in-the-ui
[3] https://docs.gitlab.com/ee/user/project/push_options.html#useful-git-aliases

Supersedes: <20201104224558.3384595-1-philmd@redhat.com>

Philippe Mathieu-Daudé (11):
  gitlab-ci: Drop generic cache rule
  gitlab-ci: Replace YAML anchors by extends (cross_system_build_job)
  gitlab-ci: Replace YAML anchors by extends (native_build_job)
  gitlab-ci: Replace YAML anchors by extends (native_test_job)
  gitlab-ci: Replace YAML anchors by extends (acceptance_test_job)
  gitlab-ci: Rename acceptance_test_job -> integration_test_job
  gitlab-ci: Extract common job definition as 'cross_common_job'
  gitlab-ci: Extract common job definition as 'native_common_job'
  gitlab-ci: Add rules to select cross-jobs to build
  gitlab-ci: Add rules to select building/testing native jobs
  gitlab-ci: Move artifacts expiry rule to common 'native_build_job'

 .gitlab-ci.d/crossbuilds.yml |  77 ++++++++++++------
 .gitlab-ci.yml               | 148 +++++++++++++++++++----------------
 2 files changed, 136 insertions(+), 89 deletions(-)

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