move CI to m03

[mgravell]

• move CI to m03
• fix versioning snafu re m03 reporting 8.7.226
• make it easier to edit the CI files from the sln

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Note

Low Risk
Changes are limited to CI/docker configuration and test-only version checks, with no impact on production library code. Main risk is CI flakiness if the pinned 8.8-m03 image behavior diverges from expectations.

Overview
Updates the docker-based integration test setup to use redislabs/client-libs-test:8.8-m03 (including .env.v8.8 and default docker-compose.yml), aligning CI with the Redis 8.8 milestone image.

Adjusts test version gating for Redis 8.8 by introducing ServerVersion.Redis_8_8 = 8.7.226 and adding an EndpointsFixture.IsAtLeast(Version) overload, then switching several tests to use this constant for feature/behavior expectations.

Adds lightweight NoTargets “hub” projects (.github/ci.csproj, tests/dockers/dockers.csproj) and wires them into NRedisStack.sln to make CI/docker files easier to edit from the solution.

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[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[cursor]

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

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