feat: allow image to be overridden for the Image Updater integration

[dkarpele]

What type of PR is this?

/kind enhancement

What does this PR do / why we need it:
The Image Updater integration should allow users to override the container image being used to run the Image Updater by introducing a new field .spec.imageUpdater.image, in alignment with other components of the Operator.

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?

Test acceptance criteria:

• Unit Test
• E2E Test

How to test changes / Special notes to the reviewer:

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• argocd-operator/docs/reference/argocd.md

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📝 Summary

Summary by CodeRabbit

• New Features

  • Added an optional configuration setting to select the container image used by the Argo CD Image Updater.
  • Image selection prioritizes the configured image, then the environment variable, and finally the default image, now using the v1.3.0 tag.

• Documentation

  • Updated the Argo CD reference documentation with the Image Updater image setting and default value.

• Tests

  • Added coverage for image selection priority, empty values, and fallback behavior.

Walkthrough

The PR adds an optional Image Updater image field to the Argo CD API and CRD schemas. Deployment generation selects the CR image first, then the environment variable, then the tagged default image. Tests validate this precedence.

Changes

Image Updater image configuration

Layer / File(s)	Summary
Image field contract and schemas argocd-operator/api/v1beta1/argocd_types.go, argocd-operator/config/crd/..., argocd-operator/bundle/..., argocd-operator/deploy/olm-catalog/...	The API type and CRD schemas add the optional image string field for the Image Updater configuration.
Image selection, validation, and documentation argocd-operator/controllers/argocd/image_updater.go, argocd-operator/controllers/argocd/image_updater_test.go, argocd-operator/docs/reference/argocd.md	Deployment generation uses selectImageUpdaterImage. The selector prioritizes the CR image, then ARGOCD_IMAGE_UPDATER_IMAGE, then the default image with the v1.3.0 tag. Tests cover these cases, and the documentation records the tagged default.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant ArgoCD CR
  participant selectImageUpdaterImage
  participant Environment
  participant Image Updater Deployment
  ArgoCD CR->>selectImageUpdaterImage: provide ImageUpdater.Image
  selectImageUpdaterImage->>Environment: check ARGOCD_IMAGE_UPDATER_IMAGE
  selectImageUpdaterImage->>Image Updater Deployment: set selected container image

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Merge Risk: ⚪ Minimal · up to 6fc38

No concrete merge-blocking defect is established by the available review evidence.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 3 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: allowing an image override for the Image Updater integration.
Description check	✅ Passed	The description explains the new .spec.imageUpdater.image field and mentions the related documentation and unit test updates.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 3 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In `@argocd-operator/docs/reference/argocd.md`:
- Line 548: Update the Image Updater entry in the documentation table to show
the tagged default image quay.io/argoprojlabs/argocd-image-updater:v1.3.0 in the
Default column.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Advanced

Run ID: 710925e5-eff9-491b-942b-ba248b572c3c

📥 Commits

Reviewing files that changed from the base of the PR and between 9e03b0a and 2822db3.

📒 Files selected for processing (9)

• argocd-operator/api/v1beta1/argocd_types.go
• argocd-operator/bundle/manifests/argoproj.io_argocds.yaml
• argocd-operator/config/crd/bases/argoproj.io_argocds.yaml
• argocd-operator/controllers/argocd/image_updater.go
• argocd-operator/controllers/argocd/image_updater_test.go
• argocd-operator/deploy/olm-catalog/argocd-operator/0.20.0/argoproj.io_argocds.yaml
• argocd-operator/docs/reference/argocd.md
• bundle/manifests/argoproj.io_argocds.yaml
• config/crd/bases/argoproj.io_argocds.yaml

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• argoproj-labs/argocd-operator (manual)

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.