Add core next minor canary job(s)

To do this, let's alter .gitlab-ci,yml such that there are two environment variables that make up the "canary" configuration:

• CANARY_CORE_RECOMMENDED: The constraint used for drupal/core-recommended.
• CANARY_PREFER_STABLE: The value of Composer's prefer-stable flag: true or false.

Then we can configure multiple overnight canary jobs that use different values for these two variables.

Asked Catch to review in Drupal Slack since I can't assign it to him.

This looks fine in principle, but I can't tell if it'll work in practice from the YAML changes.

Since it will only affect the canary job, seems worth merging and setting up the pipelines and tweaking if it needs more. There is the same chicken and egg problem with core pipelines where it's awkward to test branch/scheduled job changes except for committing them, it's possible to do on a full fork of the project but that takes a fair bit of time to set up.

Moving to RTBC based on comments in #6, thanks!

I guess we'll see what happens!

Merged into 1.x. Thanks!

This seems to have worked. The most recent overnight canary run installed Drupal 11.x-dev and most dependencies in non-stable dev branches: https://git.drupalcode.org/project/drupal_cms/-/jobs/4174541#L89

Woo!

Is the next step to set up a couple more canary jobs on https://git.drupalcode.org/project/drupal_cms/-/pipeline_schedules ? I think I came up with two more in the issue summary, although I'm not 100% certain those are the only additional variations that exist.

I agree. Here's what we have set up:

Canary: dev core, stable contrib
core-recommended 11.x-dev@dev
prefer-stable is true

Canary: stable core, dev contrib
core-recommended: ^11.1@stable
prefer-stable is false

Canary: dev core and contrib
prefer-stable is false

They each run an hour apart. Hopefully they do what we want!

I kicked off a run of these canary pipelines and they seem to be doing exactly what I hoped for!!

Stable core, dev contrib: https://git.drupalcode.org/project/drupal_cms/-/jobs/4178476
Dev core, stable contrib: https://git.drupalcode.org/project/drupal_cms/-/jobs/4178447

Automatically closed - issue fixed for 2 weeks with no activity.