fix: Makefile - build-testkube-cli target - rebuild CLI if binary already exist

[tkonieczny]

Fix for:

$ make build-testkube-cli
make: Nothing to be done for `build-testkube-cli'.

not running go build even if binary is outdated

[testkubebot]

✅ Testkube GitHub Integration

Review based on commit 3d4a5be.

All tests and quality gates passed.

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Phase	Status
Test Workflow Execution	✅ Passed
Quality Gate	✅ Passed

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7 workflows executed

✅ lint-go passed in 5m12s
_{🚀 29. Sep. 2026 - 16:22:37 UTC / 🏁 29. Sep. 2026 - 16:27:50 UTC}

✅ lint-proto passed in 17s
_{🚀 29. Sep. 2026 - 16:22:37 UTC / 🏁 29. Sep. 2026 - 16:22:55 UTC}

✅ integration-tests passed in 7m43s
_{🚀 29. Sep. 2026 - 16:22:37 UTC / 🏁 29. Sep. 2026 - 16:30:21 UTC}

✅ unit-tests passed in 4m19s
_{🚀 29. Sep. 2026 - 16:22:37 UTC / 🏁 29. Sep. 2026 - 16:26:57 UTC}

✅ verify-crds passed in 2m13s
_{🚀 29. Sep. 2026 - 16:22:37 UTC / 🏁 29. Sep. 2026 - 16:24:51 UTC}

✅ verify-protobuf passed in 17s
_{🚀 29. Sep. 2026 - 16:22:37 UTC / 🏁 29. Sep. 2026 - 16:22:55 UTC}

✅ lint-pr passed in 16s
_{🚀 29. Sep. 2026 - 16:22:37 UTC / 🏁 29. Sep. 2026 - 16:22:54 UTC}

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[greptile-apps]

Confidence Score: 5/5

[Low risk] Build system makefile target declaration fix.

The PR appears safe to merge.

Summary

The PR makes both CLI build targets run go build even when their binaries already exist. No merge-blocking issue was established.

_{Reviews (1) · Last reviewed commit: "Makefile - build-testkube-cli - (re)buil..."}