ci: add optimized release PHP variant with debug symbols

[Leiyks]

Description

Add two new PHP variants to all bookworm CI images:

• 'release-nts': Optimized non-thread-safe with debug symbols
• 'release-zts': Optimized Zend thread-safe with debug symbols

Both variants provide:

• Full -O2 optimization for production performance
• Debug symbols (-g flag) for profiling and debugging
• No --enable-debug flag (avoids debug build overhead)

These variants are optimized for benchmarking and profiling scenarios where
both performance and symbol availability are required.

Changes:

• Modified build-php.sh to set CFLAGS="-O2 -g" for release-* variants
• Added php-release-nts and php-release-zts build stages to all PHP version
  Dockerfiles (7.0-8.5)
• Added both variants to final image in /opt/php/release-nts and
  /opt/php/release-zts

Usage:
switch-php release-nts # For non-thread-safe builds
switch-php release-zts # For thread-safe builds

[datadog-datadog-prod-us1]

⚠️ Tests

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

🧪 1026 Tests failed

    testSearchPhpBinaries from integration.DDTrace\Tests\Integration\PHPInstallerTest (Fix with Cursor)

    testSimplePushAndProcess from laravel-58-test.DDTrace\Tests\Integrations\Laravel\V5_8\QueueTest (Fix with Cursor)

    testSimplePushAndProcess from laravel-8x-test.DDTrace\Tests\Integrations\Laravel\V8_x\QueueTest (Fix with Cursor)

View all

ℹ️ Info

❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 015808a | Docs | Datadog PR Page | Was this helpful? Give us feedback!}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.21%. Comparing base (72a021a) to head (015808a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3657   +/-   ##
=======================================
  Coverage   62.21%   62.21%           
=======================================
  Files         141      141           
  Lines       13387    13387           
  Branches     1753     1753           
=======================================
  Hits         8329     8329           
  Misses       4260     4260           
  Partials      798      798           

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