gitlab ci rule 用法

GitLab CI rules allow you to define when a job should be created and run based on a set of conditions. Here are a few examples of how to use GitLab CI rules in your pipeline:

1. Trigger a job based on changes in a specific file or directory:

job:
  script: echo "Hello, world!"
  rules:
    - changes:
        - path/to/file

In this example, the job will be triggered only when there are changes in the `path/to/file` directory.

2. Trigger a job based on the creation of a new branch:

job:
  script: echo "Hello, world!"
  rules:
    - if: '$CI_COMMIT_BRANCH == "new-branch"'

In this example, the job will be triggered only when a new branch called `new-branch` is created.

3. Trigger a job based on the value of a specific variable:

job:
  script: echo "Hello, world!"
  rules:
    - if: '$ENVIRONMENT == "production"'

In this example, the job will be triggered only when the `ENVIRONMENT` environment variable is set to `production`.

4. Trigger a job based on a specific schedule:

job:
  script: echo "Hello, world!"
  rules:
    - if: '$CI_PIPELINE_SOURCE == "schedule"'

In this example, the job will be triggered only when it is scheduled to run based on a specific time interval.

These are just a few examples of how to use GitLab CI rules in your pipeline. By using rules, you can create a highly customized and flexible pipeline that meets the specific needs of your project.