docs: add the missing Apache-2.0 LICENSE file

[Andrei Kvapil (kvaps)]

What this PR does

This repository has no LICENSE file. Not at the root, not anywhere in the tree — GET /repos/cozystack/etcd-operator/license returns 404 and GitHub reports no licence for the repository.

Meanwhile every source file carries the Apache-2.0 header (Copyright 2023 Timofey Larkin., see hack/boilerplate.go.txt) and the README states:

License

Apache 2.0. See LICENSE.

So the terms the sources point at are not actually present in the repository.

This matters beyond tidiness: etcd-operator ships into the Cozystack distribution three ways — the controller image (packages/system/etcd-operator/values.yaml), the CRDs (packages/system/etcd-operator-crds/Makefile), and the etcd-migrate binary baked into the platform-migrations image (packages/core/platform/images/migrations/Dockerfile). A component in the artifact adopters install, with no repository-level licence grant, is a finding any licence review will raise.

This adds the verbatim Apache License 2.0 text. No terms change: it makes explicit the licence the file headers have asserted since 2023.

Summary by CodeRabbit

• Documentation
  • Added the Apache License, Version 2.0, covering usage rights, redistribution requirements, contributions, trademarks, warranties, and liability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d131675a-655e-41fe-b798-ff90601cc91c

📥 Commits

Reviewing files that changed from the base of the PR and between a60dd56 and aef356b.

📒 Files selected for processing (1)

• LICENSE

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📝 Walkthrough

Walkthrough

The repository adds the complete Apache License, Version 2.0 text in a new LICENSE file. No exported or public declarations change.

Changes

Repository licensing

Layer / File(s)	Summary
Add Apache License text LICENSE	The repository adds Apache License, Version 2.0 terms covering use, reproduction, modification, distribution, contributions, trademarks, warranties, liability, and license notices.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: androndo, lllamnyp

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the addition of the missing Apache-2.0 LICENSE file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/add-license

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