Cloud Native CI/CD with GitLab

When Data is Merged vs Replaced?

We have seen an example that shows how Gitlab merges a section from the base configuration with the section that extends it + overrides the redefined keys. This process is a merge operation. Let's take this example as a reminder:

.base:
  variables:
    VAR1: "value1"
    VAR2: "value2"
job:
  extends: .base
  variables:
    VAR1: "new_value1"

The resulting job will look like this:

job:
  variables:
    VAR1: "new_value1"
    VAR2: "value2"

However, there's a trap when it comes to lists. Here is an example:

.base:
  script:
    - echo "command1"