feat: add the igbinary extension

[loks0n]

Summary

• Compiles and enables igbinary in the production image, alongside the other extensions.
• Pins igbinary 3.2.17RC1 by commit. It is the first tag that builds on PHP 8.5, and no final 3.2.17 exists yet. The weekly dependency updater only understands x.y.z pins and throws on anything else, so the commit is inlined in the build stage with a comment rather than declared as PHP_IGBINARY_VERSION/PHP_IGBINARY_COMMIT. Once igbinary tags a final release it should move into the catalog like the others.
• Adds igbinary to the module list in tests.yaml and a changelog entry under 2.1.0.

Why

Appwrite is switching its Redis cache payloads from JSON to igbinary through the new Igbinary codec in utopia-php/cache 5.1.0. On a page of 50 documents igbinary stores about a quarter of the bytes and loads 2.4x faster through Redis. The Appwrite PR depends on this landing and being released as 2.1.0.

Testing

• composer verify passes (156 tests).
• I could not compile-check locally because my Docker daemon has a stuck layer for the PHP 8.5 Alpine image, so the image build in this PR's CI is the compile check.

🤖 Generated with Claude Code

[greptile-apps]

Confidence Score: 4/5

The image implementation appears sound, but the repository’s explicit behavior-testing requirement must be satisfied before merging.

Findings

1.  Module Test Mirrors Configuration ▶

Fix with agent prompt

### Issue 1
tests.yaml:47
Adding `igbinary` to the `php -m` output list only confirms that the Dockerfile enabled the module; it does not exercise serialization or deserialization. This violates the repository directive to test observable behavior instead of mirroring source configuration and could allow a loaded but nonfunctional extension to pass. This requirement must be satisfied before merging, for example with a command test that round-trips a representative value through `igbinary_serialize()` and `igbinary_unserialize()`.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

Summary

This PR compiles a commit-pinned PHP 8.5-compatible igbinary extension, installs and enables it in the production image, documents the addition, and extends the container tests.

• Adds a dedicated native build stage for igbinary.
• Copies and enables igbinary.so in the final image.
• Adds a changelog entry and a module-presence assertion.
• The new assertion should instead exercise an observable serialization round trip.

_{Reviews (1) · Last reviewed commit: "feat: add the igbinary extension"}

[greptile-apps]

Module Test Mirrors Configuration

Adding igbinary to the php -m output list only confirms that the Dockerfile enabled the module; it does not exercise serialization or deserialization. This violates the repository directive to test observable behavior instead of mirroring source configuration and could allow a loaded but nonfunctional extension to pass. This requirement must be satisfied before merging, for example with a command test that round-trips a representative value through igbinary_serialize() and igbinary_unserialize().

Context Used: Call out and harshly judge implementation-coupled tests. We don't mirror source code, configuration, or version pins in assertions. We test observable behavior; use linters for syntax and schema checks. (source)

Prompt To Fix With AI

This is a comment left during a code review.
Path: tests.yaml
Line: 47

Comment:
**Module Test Mirrors Configuration**

Adding `igbinary` to the `php -m` output list only confirms that the Dockerfile enabled the module; it does not exercise serialization or deserialization. This violates the repository directive to test observable behavior instead of mirroring source configuration and could allow a loaded but nonfunctional extension to pass. This requirement must be satisfied before merging, for example with a command test that round-trips a representative value through `igbinary_serialize()` and `igbinary_unserialize()`.

**Context Used:** Call out and harshly judge implementation-coupled tests. We don't mirror source code, configuration, or version pins in assertions. We test observable behavior; use linters for syntax and schema checks. ([source](https://app.greptile.com/review/custom-context?memory=instruction-0))

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

[loks0n]

CI confirms the pin: the image built on amd64 and arm64, and the structure test's php -m check passed with igbinary in the module list. Ready for review; once merged and released as 2.1.0, appwrite/appwrite#13732 can come out of draft.