Ludy 3fd0398648 chore(ci): streamline GitHub workflows, labels, and license automation for main (#5356)
# Description of Changes

This pull request makes several updates to the repository’s CI/CD
configuration, focusing on improving workflow automation, updating Java
versions, enhancing labeling and file ownership, and cleaning up unused
files. The most significant changes involve migrating workflows and
labels to support a new `V3` branch, updating build environments to use
JDK 21, and expanding automated dependency update coverage.

**Key changes include:**

### CI/CD Workflow Updates

* Updated all GitHub Actions workflows (`build.yml`,
`PR-Demo-Comment-with-react.yml`, etc.) to use JDK 21 instead of JDK 17
for Java builds, ensuring compatibility with newer Java features and
dependencies.
[[1]](diffhunk://#diff-5c3fa597431eda03ac3339ae6bf7f05e1a50d6fc7333679ec38e21b337cb6721L120-R125)
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* Removed the now-unused `codeql.yml-disabled` file, cleaning up
deprecated static analysis configuration.
* Added a dedicated `frontend-validation` job in `build.yml` that only
runs when frontend files change, improving CI efficiency.
* Minor workflow improvements: consistent quoting in config paths,
improved cache settings, and small cleanups in deploy scripts.
[[1]](diffhunk://#diff-5c3fa597431eda03ac3339ae6bf7f05e1a50d6fc7333679ec38e21b337cb6721L150-R152)
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### Branch and Label Management

* Migrated auto-labeler and build workflows to track the `V3` branch
instead of `V2`, and updated labels and labeler config to use `v3`
instead of `v2`.
[[1]](diffhunk://#diff-cfe84f4bb9657c721ff741644ee0bce45aa81aaef9dea1ea8741c946984e9722L7-R7)
[[2]](diffhunk://#diff-d3d79c492fbafebc87fbb739c553afea093a79344ff78b88fe785ac3ca7e7b3dL49-R75)
[[3]](diffhunk://#diff-080b7ef0dc11b28f262ea02985043c6229e353ecfdd5920b4d3b19f369f85dc6R87-R89)
* Added new labels for `v3`, `Rust`, `Tauri`, and
`license-review-required` to improve PR categorization and review
processes.

### Dependency Automation

* Expanded `dependabot.yml` to update Gradle dependencies in all
relevant subdirectories (`/`, `/app/common`, `/app/core`,
`/app/proprietary`) and ensured all ecosystems use the `rebase-strategy:
auto` setting for more reliable PR updates.

### File Ownership and Labeling

* Enhanced `.github/config/.files.yaml` to include new scripts and
frontend-related files under the correct project and frontend
categories, and introduced license file groups for both frontend and
backend.
[[1]](diffhunk://#diff-16e8af5ab290e6fdcf843429e4970b7dee6721897ad02c5291f259f47e0978deL5-R7)
[[2]](diffhunk://#diff-16e8af5ab290e6fdcf843429e4970b7dee6721897ad02c5291f259f47e0978deR34-R60)
* Improved labeler configuration to better match new frontend and
translation file patterns, and introduced a new label group for
Tauri-related files.

---

These changes collectively modernize the repository’s automation,
streamline maintenance, and prepare the project for ongoing work on the
`V3` branch.

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.
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Stirling PDF logo

Stirling PDF - The Open-Source PDF Platform

Stirling PDF is a powerful, open-source PDF editing platform. Run it as a personal desktop app, in the browser, or deploy it on your own servers with a private API. Edit, sign, redact, convert, and automate PDFs without sending documents to external services.

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Stirling PDF - Dashboard

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For a full feature list, see the docs: https://docs.stirlingpdf.com

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docker run -p 8080:8080 docker.stirlingpdf.com/stirlingtools/stirling-pdf

Then open: http://localhost:8080

For full installation options (including desktop and Kubernetes), see our Documentation Guide.

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For development setup, see the Developer Guide.

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Description
locally hosted web application that allows you to perform various operations on PDF files
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