Create a central image utility package

[mozesl-nokia]

Create a central image utility package

Originally part of #1019

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Description

• What changed: Added a new go package under pkg/util/image
• Why it’s needed: So we don't have different, fragmented handling of OCI image name parsing
• How it works: Parsing logic based on distribution and regclient, with some regex taken from the latter

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Related Issue(s)

• Helps with EPIC: FunctionConfig controller improvements #1093

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Type of Change

• Enhancement
• Refactor

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Checklist

• Code follows project style guidelines
• Self-reviewed changes
• Tests added/updated
• Documentation added/updated
• All tests and gating checks pass

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Additional Notes (Optional)

• Further improvements: Wrap or use distribution/reference types and google/go-containerregistry/name types

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AI Disclosure

• I have used AI in the creation of this PR.

If so, please describe how:

• Cursor's composer 2.5 was used to review the changes and write the unit test

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[Copilot]

Pull request overview

This PR introduces a centralized Go utility package for OCI image reference handling and migrates existing image parsing/joining/semver-selection call sites to use it, reducing duplicated and inconsistent parsing logic across the codebase.

Changes:

• Added pkg/util/image with Parse, Join, and FindBestSemverMatch, plus unit tests.
• Removed legacy image helpers and semver matching from pkg/util/util.go (and corresponding tests).
• Updated engine/runtime and function executor/controller code paths to use the new image utility.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pkg/util/util.go	Removes legacy semver and image string helpers in favor of the new package.
pkg/util/util_test.go	Removes tests that covered the deleted semver helper.
pkg/util/image/types.go	Adds ParsedImage struct and helpers to reconstruct/present parsed references.
pkg/util/image/regex.go	Adds registry-detection regex (sourced from regclient) used by parsing logic.
pkg/util/image/image.go	Implements semver tag selection, join helper, and reference parsing.
pkg/util/image/image_test.go	Adds unit tests for semver selection and parsing behavior.
pkg/engine/builtinruntime.go	Switches builtin runner logic to use the new parsing + semver utilities.
pkg/engine/builtinruntime_test.go	Updates tests to use new join helper and adjusts logging expectations.
func/internal/podcachemanager.go	Switches function keying/joining to new parsing/join utilities.
func/internal/executableevaluator.go	Adjusts logging verbosity for explicit-tag execution path.
func/internal/executableevaluator_test.go	Updates join usage, log assertions, and ensures klog verbosity in tests.
controllers/functionconfigs/reconciler/functionconfigreconciler.go	Refactors cache lookups to use parsed image components and new semver helper.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
98.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud