update apollo-federation-php with latest schema changes

[dariuszkuc]

See #166 for details.

Resolves #193

[dariuszkuc]

Federation PHP Compatibility Results

Federation 1 Support	Federation 2 Support
_service ❌ @key (single) ❌ @key (multi) 🔲 @key (composite) 🔲 repeatable @key 🟢 @requires 🔲 @provides 🟢 federated tracing 🔲	@link ❌ @shareable 🔲 @tag 🔲 @override 🔲 @inaccessible 🔲

[rvanlaak]

Does the above comment on this PR mean that the support as documented on the Apollo support pages is different as expected?

Or, given that the composer.json in this repo's implementations/php folder requires both the webonyx/graphql-php and skillshare/apollo-federation-php, does that mean that solely the skillshare package is actively tested? Because if so, then it might be better to rename that PHP folder to include that library?

[rvanlaak]

Would it be an idea to create a follow-up ticket to test the most popular and promising PHP libraries as documented on https://graphql.org/code/#php ?

As example, https://github.com/axtiva/flexible-graphql-php seems to add Federation 2 support on top of webonlyx/graphql-php, but for that library the support does not seem tested yet? (created issue there axtiva/flexible-graphql-php#22)

[dariuszkuc]

Does the above comment on this PR mean that the support as documented on the Apollo support pages is different as expected?

There was a bug (fixed) in how the tests were run (testing old code vs actually changed code) - latest results from CI/CD show the correct results that are the same as published on our docs page.

Or, given that the composer.json in this repo's implementations/php folder requires both the webonyx/graphql-php and skillshare/apollo-federation-php, does that mean that solely the skillshare package is actively tested? Because if so, then it might be better to rename that PHP folder to include that library?

Many GraphQL libraries follow the pattern of "core" library, federation library and high level framework (sometimes they are combined). As documented on our test results page webonyx/graphql-php (reference implementation of GraphQL in PHP) implementation is tested together with skillshare/apollo-federation-php which is a federation library. As per the GraphQL PHP maintainers there are not planning on adding built-in federation support in the core library and they suggest adding the support through additional libraries (i.e skillshare/apollo-federation-php).

Would it be an idea to create a follow-up ticket to test the most popular and promising PHP libraries as documented on https://graphql.org/code/#php ?

You can open a ticket but since integrations are primarily community driven, a PR with example integration would be even better. Check out the subgraph maintainers implementation guide, information about executed tests and contributing guide for more details.