How to connect a dependent repository with a specific commit in Git?

Question

git

Good afternoon.
It is necessary to implement control of the program configuration by means of GIT.
The program consists of 2 parts: binary files of the software version and text files of the configuration.
I want to connect binary files to configuration files as a dependent repository, but neither subtree nor submodules can refer to a specific assembly.
Perhaps there is some alternative solution? Was thinking about using a shell script to clone a git repo into a folder, but to change the version would have to tamper with the script each time. For storage I use GitLab, then environment variables, unfortunately, are not suitable.

Answer 1

but neither subtree nor submodules can refer to a specific assembly.

Here is an incorrect statement. The build hash is written to the parent repository's commit tree and can be seen
git submodule status

Answer 2

If anyone needs it in the future. Solved the problem using GitLab CI\CD.
Code on the example of the libgit2 repository.
You also need to add a check for changes in libgit2, otherwise pipline will crash with an error:

On branch master
Your branch is up to date with 'origin/master'.
nothing to commit, working tree clean

## compile – название процесса, потом увидим его в интерфейса
compile:
  ## stage – этап билда, по дефолтку их три: build, test, deploy.
  ## Для нас в данной ситуации это не критично
  stage: build
  ## переходим к самому крипту
  script:
    - git clone https://your/repo.git --depth 1
    - git clone https://github.com/libgit2/libgit2.git
    - cd libgit2
    - git checkout v1.0.0
    - cd ..
    - rm -r repo/libgit2
    - mv libgit2 repo
    - cd atm_custom
    - git add --all
    - git config --local --replace-all user.email "[email protected]"
    - git config --local --replace-all user.name "Gitlab CI"
    - git commit -m '[skip ci]Automated commit for CI'
    - git push https://your/repo.git