chore: Add support for persistent store contract tests.

[kinyoklion]

Summary

Adds support for running persistent data store contract tests against the C++ server SDK's Redis integration.

Key changes:

• CI action (.github/actions/ci/action.yml): Added use_redis input, passed as $4 to build.sh to explicitly control LD_BUILD_REDIS_SUPPORT.
• scripts/build.sh: Added $4 parameter for explicit Redis support toggle (overrides automatic target-name detection when provided).
• server-redis.yml: Added use_redis: true to all Redis workflow jobs to ensure Redis support is enabled now that $4=false (the default) would otherwise override auto-detection.
• server.yml: Enabled use_redis: true and enable_persistence_tests: true for both contract test jobs.
• Contract test data model: Added ConfigPersistentCache, ConfigPersistentStore, and ConfigPersistentDataStore structs; wired persistentDataStore into ConfigParams.
• Contract test service (entity_manager.cpp): Implemented Redis persistent store creation and cache mode configuration (off, ttl, infinite) behind LD_REDIS_SUPPORT_ENABLED compile flag.
• Capability registration (main.cpp): Advertises persistent-data-store-redis when Redis support is compiled in.
• CMakeLists.txt: Conditionally links launchdarkly::server_redis_source and defines LD_REDIS_SUPPORT_ENABLED when LD_BUILD_REDIS_SUPPORT is ON.

Updates since last revision:

• Merged latest main which now includes PR chore: update CI runners and dependencies for macOS and Windows #505 (CI runner + OpenSSL + Boost pin fixes) and PR fix: update foxy for Boost 1.90 compatibility and unpin macOS Boost #506 (foxy Boost 1.90 compatibility + Boost unpin). All CI dependencies are resolved — all 44 checks pass.

Review & Testing Checklist for Human

• Verify the "infinite" cache mode implementation (24 * 365 hours TTL) matches what the contract test harness expects — confirm there isn't a dedicated "infinite" API on LazyLoadBuilder.
• Verify the "off" cache mode (CacheRefresh(std::chrono::seconds(0))) actually disables caching in the LazyLoadBuilder API as intended (i.e., 0 seconds means "don't cache" rather than "always stale").
• Confirm that the build.sh $4 parameter logic doesn't break any other callers of build.sh that may pass positional arguments differently. Note: when $4 is not provided, the variable is unset and the existing auto-detection logic is preserved.
• Run the persistence contract tests end-to-end against a Redis instance to confirm they pass. CI builds the test binary with Redis support, but Mac/Windows Redis tests are still TODO (no Redis service available on those runners).

Notes

• Link to Devin session
• Requested by: @kinyoklion

[kinyoklion]

Devin, please update with the latest changes from main.

[devin-ai-integration]

Done — merged latest main (includes PR #505 and #506 changes) into this branch. Waiting for CI now.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, have a team admin enable autofix in the Cursor dashboard.}

[cursor]

Missing Redis service container for persistence contract tests

High Severity

The contract-tests and contract-tests-curl jobs enable enable_persistence_tests: true and build with use_redis: true, but neither job defines a Redis services: container. Contrast with server-redis.yml, which properly includes a services: redis: block with the Redis image and port mapping. The persistence tests will attempt to connect to Redis at runtime and fail because no instance is running.

Additional Locations (1)

• .github/workflows/server.yml#L63-L64