CI: Variables for groupd jobs' index and total

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Problem to solve

If there's a need to use grouped job's index, such things need to be added to .gitlab-ci.yml:

.template:
  script: ...

1/2 job:
  extends: .template
  variables:
    GROUP_INDEX: 1

2/2 job:
  extends: .template
  variables:
    GROUP_INDEX: 2

Proposal

Similar behaviour is implemented in parallelized jobs (taken from documentation):

• CI_NODE_INDEX Index of the job in the job set. If the job is not parallelized, this variable is not set.
• CI_NODE_TOTAL Total number of instances of this job running in parallel. If the job is not parallelized, this variable is set to 1.

Considering that we already have these variables when defining jobs (1/2), they might be simply translated to predefined variables. Corresponding to the parallelized jobs variables names would be CI_GROUP_INDEX and CI_GROUP_TOTAL

With such approach there might be much smaller jobs' description:

.template:
  script: echo $CI_GROUP_INDEX

1/2 job:
  extends: .template

2/2 job:
  extends: .template  

In my company there are groups of 20 jobs where we have to define Indexes manually in .gitlab-ci.yml

Links / references