Use multiple 'workflows' in gitlab ci?

Lets Imagine I want to have 2 different CI Pipelines in gitlab. The first one should start with every push on any branch the other one only when the commit title ends with deploy.

How do I realise that?

So my Idea:

.gitlab-ci.yml

stages:
  - pre
  - build


include:
  - local: ci/a.gitlab-ci.yml
  - local: ci/b.gitlab-ci.yml

a.gitlab-ci.yml

workflow:
  rules:
  # only triggered by "-deploy" at the end of commit 
    - if: $CI_COMMIT_TITLE == /-deploy$/ 

test-job1:
  stage: pre
  script:
    - echo "Workflow a runs pre."
  tags:
    - x86

test-job2:
  stage: build
  script:
    - echo "Workflow a runs build."
  tags:
    - x86

b.gitlab-ci.yml

workflow:
  rules:
  # only triggered if commit does not end with  "-deploy"  
    - if: $CI_COMMIT_TITLE =~ /-deploy$/ 

test-job1:
  stage: pre
  script:
    - echo "Workflow b runs pre."
  tags:
    - x86

test-job2:
  stage: build
  script:
    - echo "Workflow b runs build."
  tags:
    - x86

Solution

To achieve the effect you want, your best bet would be to use include:rules: for this instead of workflow:rules:.

I believe you also may have a small error in the regex matching rule. You probably wanted to be using the regex match operator (=~ i.e., does match the pattern) in the first case and the negative match re operator (!~ i.e., does not match the pattern) in the second case.

include:
  - local: ci/a.gitlab-ci.yml
    rules:
      - if: $CI_COMMIT_TITLE =~ /-deploy$/
  - local: ci/b.gitlab-ci.yml
    rules:
      - if: $CI_COMMIT_TITLE !~ /-deploy$/

Then remove the workflow:rules: from each respective template.