There is no git in the docker image?

[melcloud]

Describe the bug
When running FerrFlow inside gitlab with ghcr.io/ferrlabs/ferrflow container image, I got following errors when trying to perform release:

  Warning: could not inspect release branch ferrflow/release-main: E2013
Error: rev-parse HEAD failed
  Caused by: spawn `git rev-parse HEAD` failed (is git in PATH?)
  Caused by: No such file or directory (os error 2)

It also happens locally as well, looks like the Dockerfile doesn't contain git?

To Reproduce
Steps to reproduce:

1. Setup a repository with ferrflow init
2. Run docker run -it --rm -e GITLAB_TOKEN -v $(pwd):/repo ghcr.io/ferrlabs/ferrflow:latest release

Expected behavior
Can parse the rev HEAD and create release

Environment

• ferrflow version: 7.21.3

• OS: MacOS

• Used as: CLI / Gitlab

• Logs / output:

  Warning: could not fetch remote tags: spawn `git fetch --tags` failed (is git in PATH?)
  Changed files in last commit:
   .gitlab-ci.yml
  
  ↻ support-manage-IIS — recovering missed release
   ✓ Updated /repo/support/manage-IIS/CHANGELOG.md
   Warning: could not inspect release branch ferrflow/release-main: E2013
  Error: rev-parse HEAD failed
   Caused by: spawn `git rev-parse HEAD` failed (is git in PATH?)
   Caused by: No such file or directory (os error 2)

[melcloud]

In addition, since gitlab requires sh to run, I have to add a entrypoint: [""], so doc needs to be updated:

ferrflow-validate:
  image:
    name: $FERRFLOW_IMAGE
    entrypoint: [""]
  stage: validate
  variables:
    GIT_DEPTH: 0
  script:
    - ferrflow doctor