quality-of-life: Improve local development tooling

[sebrandon1]

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This PR updates the Makefile with .PHONY targets, better error handling for deploy/undeploy, and adds README.md sections on cleanup, tests, and linting.

Makefile Enhancements:

• Added .PHONY declarations to multiple targets (local-run, build-operator, build, run, image-build, image-push, deploy, undeploy, test-e2e-wait-for-stable-state, test-e2e-debug-cluster, lint) to ensure proper execution and avoid conflicts with files of the same name. [1] [2] [3] [4] [5]

• Improved the deploy target to create the cert-manager-operator namespace if it does not exist, ensuring smoother deployment.

• Enhanced the undeploy target to ignore not-found errors when deleting resources, improving robustness.

• Added a check in the lint target to ensure golangci-lint is installed before running, providing a clearer error message if it is missing.

Documentation Updates:

• Added a "Cleaning up the deployment" section in README.md, explaining how to remove the Cert Manager Operator and its associated resources using make undeploy.

• Introduced a "Running tests locally" section in README.md, detailing how to execute unit tests and generate a coverage report.

• Added a "Linting the code" section in README.md, describing how to run make lint to check for linting issues using golangci-lint.

[bharath-b-rh]

/retest

[coderabbitai[bot]]

Walkthrough

Adds numerous PHONY Makefile targets for local run, build, run, image build/push, deploy/undeploy with namespace handling, opm download, and e2e wait/debug flows, plus a lint invocation tweak. README gains additional sections for cleanup, testing, and linting, including duplicated guidance blocks.

Changes

Cohort / File(s)	Summary of changes
Build, run, deploy, and test automation Makefile	Adds PHONY targets: local-run, build-operator, build, run, image-build, image-push, deploy, undeploy, opm, test-e2e-wait-for-stable-state, test-e2e-debug-cluster. Implements namespace guard in deploy, safe deletion in undeploy, opm downloader, e2e wait/debug orchestration, and a minor lint command adjustment.
Documentation updates README.md	Adds sections for cleanup (make undeploy), running tests (make test, coverage), and linting (make lint), with some duplicated sections appearing in multiple locations.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title "quality-of-life: Improve local development tooling" concisely and accurately summarizes the primary intent of the changeset — Makefile additions and improvements to local developer workflows (and accompanying README updates) — making it clear and relevant for reviewers scanning history.
Description Check	✅ Passed	The PR description directly describes the Makefile and README changes present in the diff, listing added .PHONY targets, deploy/undeploy robustness, a lint precheck, and the new documentation sections, so it is on-topic and adequately related to the changeset.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment

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[openshift-ci[bot]]

@sebrandon1: all tests passed!

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[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bharath-b-rh, sebrandon1

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[bharath-b-rh]

no user facing changes /label docs-approved /label qe-approved /label px-approved