'Why submodules are not updated using GIT_SUBMODULE_STRATEGY:recursive

I created a .gitmodules file in the root of MASTER's project:

[submodule "SLAVE"]
    path = SLAVE
    url = ../../my-group/SLAVE.git

Added to MASTER's .gitlab-ci.yml:

variables:
  GIT_SUBMODULE_STRATEGY: recursive

Triggered MASTER's CI pipeline.

As a result, no changes made in SLAVE project were applied while running MASTER's CI

gitlab-ci

Solution 1:^[1]

You need to add GIT_SUBMODULE_UPDATE_FLAGS to the .gitlab-ci.yml.

variables:
    GIT_SUBMODULE_STRATEGY: recursive
    GIT_SUBMODULE_UPDATE_FLAGS: --remote --merge

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Solution	Source
Solution 1	ouflak