Add script to update the git-sync image

[Camila-B]

This is a first step towards automating image updates

[google-oss-prow]

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[gemini-code-assist]

Summary of Changes

Hello @Camila-B, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new automation script and integrates it into the Makefile, marking a significant step towards automating image updates. The primary goal is to simplify the maintenance of the git-sync image version by providing a standardized and executable method for fetching and applying the latest versions or builds, thereby reducing manual effort and potential for errors.

Highlights

• New Automation Script: A new shell script, scripts/update-git-sync-image.sh, has been added to automate the process of updating the git-sync image version in the Makefile.
• Makefile Integration: A new make update-git-sync-image target has been introduced in the Makefile to easily execute the new automation script. Comments have also been added to guide users on how to run this command with different UPDATE_TYPE options.
• Script Refinement: An unused err function was removed from scripts/update-debian-base-image.sh to streamline the script and remove dead code.

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Changelog

• Makefile
  • Added a new update-git-sync-image target to invoke the new update script.
  • Included comments explaining how to use the update-git-sync-image target with UPDATE_TYPE.
• scripts/update-debian-base-image.sh
  • Removed an unused err function and related comments.
• scripts/update-git-sync-image.sh
  • Added a new script to fetch the latest git-sync image tag from gcr.io/config-management-release/git-sync.
  • Implemented logic to determine the latest tag based on UPDATE_TYPE (latest-version or latest-build).
  • Updated the GIT_SYNC_VERSION in the Makefile if a newer tag is found.

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[gemini-code-assist]

Code Review

The pull request introduces a new script and Makefile target to automate the update of the git-sync image version. This is a positive step towards better dependency management. I have identified a few areas for improvement, primarily focusing on making the string parsing more robust against comments in the Makefile and ensuring consistency with existing update scripts.

[gemini-code-assist]

The grep command here is not anchored to the start of the line. If a comment in the Makefile contains the string GIT_SYNC_VERSION :=, this command will return multiple lines, which will cause the script to fail or behave unexpectedly when processing CURRENT_TAG later. Anchoring the search to the beginning of the line ensures only the actual variable assignment is matched.

Suggested change

	CURRENT_TAG=$(grep "GIT_SYNC_VERSION :=" Makefile | sed 's/.*:= //')
	CURRENT_TAG=$(grep "^GIT_SYNC_VERSION :=" Makefile | sed 's/.*:= //')

[gemini-code-assist]

For consistency with scripts/update-debian-base-image.sh and to avoid potential issues if the image tag ever contains a forward slash (though unlikely for this specific image), it is better to use a different delimiter like | for the sed command. Additionally, ensure the pattern is anchored to the start of the line to avoid accidental matches in comments.

Suggested change

	sed -i "s/^GIT_SYNC_VERSION := .*/GIT_SYNC_VERSION := ${LATEST_TAG}/" Makefile
	sed -i "s|^GIT_SYNC_VERSION := .*|GIT_SYNC_VERSION := ${LATEST_TAG}|" Makefile