Feature: CLI cache warmup (cache:flush/clean --warmup, cache:warmup)

[Genaker]

Fixes #40636

Description

Adds optional full-page cache warmup from the CLI after cache:flush and cache:clean, plus a standalone cache:warmup command.

• cache:flush --warmup / -w and cache:clean --warmup / -w: after the cache operation, runs HTTP GET against configured URLs (or the storefront base URL if none configured).
• bin/magento cache:warmup: warms caches without flushing or cleaning.
• Admin configuration: Stores > Configuration > Advanced > Developer > CLI Cache Warmup — multiline URLs and HTTP timeout (default 30s).

Implementation: Magento\Backend\Model\Cache\WarmupRunner (reuses Magento\Framework\HTTP\Client\Curl).

Manual testing scenarios

1. Leave Warmup URLs empty; run bin/magento cache:warmup — should GET the storefront base URL and print stage/progress and summary.
2. Set one or more URLs; run bin/magento cache:flush --warmup — should flush, then warm each URL.
3. Run bin/magento cache:clean -w full_page with warmup enabled — same behavior for clean.

Unit tests

• Magento\Backend\Test\Unit\Model\Cache\WarmupRunnerTest
• Magento\Backend\Test\Unit\Console\Command\CacheWarmupCommandTest
• Extended CacheFlushCommandTest / CacheCleanCommandTest for --warmup

Run:
./vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist app/code/Magento/Backend/Test/Unit/Model/Cache/WarmupRunnerTest.php app/code/Magento/Backend/Test/Unit/Console/Command/CacheWarmupCommandTest.php app/code/Magento/Backend/Test/Unit/Console/Command/CacheFlushCommandTest.php app/code/Magento/Backend/Test/Unit/Console/Command/CacheCleanCommandTest.php

[m2-assistant]

Hi @Genaker. Thank you for your contribution!
Here are some useful tips on how you can test your changes using Magento test environment.
❗ Automated tests can be triggered manually with an appropriate comment:

• @magento run all tests - run or re-run all required tests against the PR changes
• @magento run <test-build(s)> - run or re-run specific test build(s)
  For example: @magento run Unit Tests

<test-build(s)> is a comma-separated list of build names.

Allowed build names are:

1. Database Compare
2. Functional Tests CE
3. Functional Tests EE
4. Functional Tests B2B
5. Integration Tests
6. Magento Health Index
7. Sample Data Tests CE
8. Sample Data Tests EE
9. Sample Data Tests B2B
10. Static Tests
11. Unit Tests
12. WebAPI Tests
13. Semantic Version Checker

You can find more information about the builds here
ℹ️ Run only required test builds during development. Run all test builds before sending your pull request for review.

---

For more details, review the Code Contributions documentation.
Join Magento Community Engineering Slack and ask your questions in #github channel.