Chore: add fast development build system for operator images

[fgksgf]

What problem does this PR solve?

• Add fast development build system that reduces image build time from minutes to ~2 seconds
• Enable rapid iteration during operator development and e2e testing

What is changed and how does it work?

Skip Go module downloads and compilation by using pre-compiled local binaries when use make dev-image/xxx

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[ti-chi-bot]

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[github-actions]

/run-pull-e2e-kind-v2

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.12%. Comparing base (f5527ea) to head (a24fa86).

Additional details and impacted files

@@             Coverage Diff             @@
##           feature/v2    #6339   +/-   ##
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  Coverage       45.12%   45.12%           
===========================================
  Files             317      317           
  Lines           21218    21218           
===========================================
  Hits             9574     9574           
  Misses          11644    11644           

Flag	Coverage Δ
unittest	45.12% <ø> (ø)

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[github-actions]

/run-pull-e2e-kind-v2

[github-actions]

/run-pull-e2e-kind-v2

[github-actions]

/run-pull-e2e-kind-v2

[github-actions]

/run-pull-e2e-kind-v2

[github-actions]

/run-pull-e2e-kind-v2

[github-actions]

/run-pull-e2e-kind-v2

[fgksgf]

/run-pull-e2e-kind-v2

[fgksgf]

/run-pull-e2e-kind-v2

[fgksgf]

/run-pull-e2e-kind-v2

[Copilot]

Pull Request Overview

This PR introduces a fast development build system for operator images to accelerate the development and testing workflow. Instead of rebuilding Go binaries during Docker image creation, it uses pre-compiled local binaries, reducing build time from minutes to approximately 2 seconds.

Key changes:

• Adds a development-specific Dockerfile that copies pre-compiled binaries instead of compiling from source
• Enhances the build system with DEV_MODE flag to toggle between development and production builds
• Updates documentation to explain the new fast build workflow

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
image/Dockerfile.dev	New development Dockerfile that copies pre-compiled binaries for faster builds
hack/lib/image.sh	Enhanced image build script with support for custom Dockerfile and dockerignore files
docs/CONTRIBUTING.md	Updated documentation explaining the new DEV_MODE build system
Makefile	Added DEV_MODE logic for image and push targets with dev-prepare-output helper
.github/licenserc.yaml	Added .dockerignore.dev to license check exclusions
.dockerignore.dev	New dockerignore file optimized for development builds

[Copilot]

Using $$ (process ID) for backup filename could cause race conditions if multiple builds run simultaneously. Consider using a more unique identifier like $(date +%s%N) or mktemp to generate unique backup filenames.

Suggested change

	dockerignore_backup="$ROOT/.dockerignore.backup.$$"
	dockerignore_backup="$(mktemp "$ROOT/.dockerignore.backup.XXXXXX")"

[Copilot]

The cp command could fail if the source dockerignore file doesn't exist, but there's no error handling. Add a check to ensure the source file exists before copying.

Suggested change

	fi
	if [[ ! -f "$ROOT/$dockerignore" ]]; then
	echo "Error: Custom dockerignore file '$ROOT/$dockerignore' does not exist." >&2
	# Restore original .dockerignore if it was backed up
	if [[ -n "$dockerignore_backup" && -f "$dockerignore_backup" ]]; then
	mv "$dockerignore_backup" "$ROOT/.dockerignore"
	fi
	exit 1
	fi
	cp "$ROOT/$dockerignore" "$ROOT/.dockerignore"