GitLab CI Warning: "git": executable file not found in $PATH

in 
WARNING: current commit information was not captured by the build: git was not found in the system: exec: "git": executable file not found in $PATH

I saw this WARNING sail by while I was watching a Docker build process run on my GitLab CI pipeline. The build wasn’t failing but wasn’t completing cleanly. The GitLab runner image being used for this pipeline was:

image: python:3.9-slim

The solve came after a bit of experimentation and found that I needed to edit my .gitlab-ci.yml file to include the following:

before_script:
  - apk add --update --no-cache git

That edit solved the Warning and cleaned up the pipeline. Noted.