[PATCH v5 1/6] ci/github: install git before checking out the repository

The GitHub's CI workflow uses 'actions/checkout@v4' to checkout the repository. This action defaults to using the GitHub REST API to obtain the repository if the `git` executable isn't available.

The step to build Git in the GitHub workflow can be summarized as:

  ...
  - uses: actions/checkout@v4 #1
  - run: ci/install-dependencies.sh #2
  ...
  - run: sudo --preserve-env --set-home --user=builder ci/run-build-and-tests.sh #3
  ...

Step #1, clones the repository, since the `git` executable isn't present at this step, it uses GitHub's REST API to obtain a tar of the repository.

Step #2, installs all dependencies, which includes the `git` executable.

Step #3, sets up the build, which includes setting up meson in the meson job. At this point the `git` executable is present.

This means while the `git` executable is present, the repository doesn't contain the '.git' folder. To keep both the CI's (GitLab and GitHub) behavior consistent and to ensure that the build is performed on a real-world scenario, install `git` before the repository is checked out. This ensures that 'actions/checkout@v4' will clone the repository instead of using a tarball. We also update the package cache while installing `git`, this is because some distros will fail to locate the package without updating the cache.

Helped-by: Phillip Wood <phillip.wood123@gmail.com>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
---
 .github/workflows/main.yml | 14 ++++++++++++++
 1 file changed, 14 insertions(+)