Per-lib CI/release workflows and build.cs scripts

[damianh]

Replaces the monolithic ci.yml and release.yml with per-lib workflows so each library builds, tests, and releases independently. Previously every push built and tested all four libs, and releasing required a package dropdown with a case statement. Conventions borrowed from the duende/foss identity-model setup.

Build infrastructure

• .github/BuildHelpers/ - shared Bullseye/SimpleExec target library providing restore, build, clean, pack, and test targets
• {lib}/{lib}.slnf - per-lib solution filters over http-lib.slnx
• {lib}/build.cs - file-based C# entry points: dotnet run signatures/build.cs -- build|test|pack

Workflows

• ci-template.yml (reusable) + four path-filtered per-lib CI workflows running build + test with trx test reporting
• hybrid-cache-handler-checks.yml - benchmarks and RFC 9111 conformance moved out of CI into their own workflow
• release-template.yml (reusable) + four per-lib release workflows, each workflow_dispatch with a single version input; existing tag prefixes (sfv-v, sig-v, cache-v, fdc-v) preserved

Notes for review

• Test projects are xUnit v3 on Microsoft.Testing.Platform, so the test target uses --report-xunit-trx rather than the generic --report-trx
• Packages version via MinVer, so the pack target does not pass /p:Version; the release template pushes the tag before packing and MinVer derives the version from it
• Verified locally: all four libs build, all 828 tests pass, pack produces packages

README badge and build/test instructions updated accordingly.

[Copilot]

Pull request overview

Refactors CI and release automation from monolithic workflows into per-library build entry points (build.cs), reusable workflow templates, and per-lib solution filters so each library can build/test/release independently.

Changes:

• Added per-lib build.cs scripts and .slnf solution filters for targeted restore/build/test/pack.
• Replaced monolithic ci.yml/release.yml with reusable ci-template.yml/release-template.yml plus per-lib CI and release workflows.
• Split hybrid-cache-handler benchmarks and RFC 9111 conformance checks into a dedicated workflow.

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
structured-field-values/structured-field-values.slnf	Adds solution filter for the structured-field-values library.
structured-field-values/build.cs	Adds per-lib build/test entry point using shared targets.
signatures/signatures.slnf	Adds solution filter for the signatures library.
signatures/build.cs	Adds per-lib build/test entry point using shared targets.
hybrid-cache-handler/hybrid-cache-handler.slnf	Adds solution filter including samples/benchmarks/conformance projects.
hybrid-cache-handler/build.cs	Adds per-lib build/test entry point using shared targets.
file-distributed-cache/file-distributed-cache.slnf	Adds solution filter for the file-distributed-cache library.
file-distributed-cache/build.cs	Adds per-lib build/test entry point using shared targets.
README.md	Updates badges and build/test instructions for per-lib scripts.
.github/workflows/structured-field-values-release.yml	Adds per-lib release workflow that calls release-template.yml.
.github/workflows/structured-field-values-ci.yml	Adds path-filtered per-lib CI workflow that calls ci-template.yml.
.github/workflows/signatures-release.yml	Adds per-lib release workflow that calls release-template.yml.
.github/workflows/signatures-ci.yml	Adds path-filtered per-lib CI workflow that calls ci-template.yml.
.github/workflows/hybrid-cache-handler-release.yml	Adds per-lib release workflow that calls release-template.yml.
.github/workflows/hybrid-cache-handler-ci.yml	Adds path-filtered per-lib CI workflow that calls ci-template.yml.
.github/workflows/hybrid-cache-handler-checks.yml	Adds separate workflow for benchmarks and RFC conformance checks.
.github/workflows/file-distributed-cache-release.yml	Adds per-lib release workflow that calls release-template.yml.
.github/workflows/file-distributed-cache-ci.yml	Adds path-filtered per-lib CI workflow that calls ci-template.yml.
.github/workflows/ci-template.yml	Introduces reusable CI workflow for build/test + trx reporting.
.github/workflows/release-template.yml	Introduces reusable release workflow driven by tag + MinVer + pack/push.
.github/workflows/ci.yml	Removes the monolithic CI workflow.
.github/workflows/release.yml	Removes the monolithic release workflow.
.github/BuildHelpers/Targets.cs	Adds shared Bullseye/SimpleExec targets for restore/build/pack/test.
.github/BuildHelpers/BuildHelpers.csproj	Adds shared helper project referenced by per-lib build scripts.

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[Copilot]

Pull request overview

Copilot reviewed 24 out of 24 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (3)

.github/workflows/ci-template.yml:51

• workflow_call input names contain hyphens, so inputs.test-targets / inputs.os-matrix are not valid property references inside expressions. This will break matrix construction (fromJson(...)) at runtime. Use bracket notation for both inputs.

      matrix:
        target: ${{ fromJson(inputs.test-targets) }}
        os: ${{ fromJson(inputs.os-matrix) }}

.github/workflows/release-template.yml:90

• inputs.tag-prefix is not a valid expression because the input name contains a hyphen. This will break the GitHub Release creation step. Use bracket notation for the tag_name value.

        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ inputs.tag-prefix }}${{ inputs.version }}
          name: ${{ inputs.package }} ${{ inputs.version }}

.github/BuildHelpers/Targets.cs:69

• dotnet test does not accept a --project option; the project/solution/directory should be provided as the positional argument. As written, this target is likely to fail in CI when invoking the test target.

    public static void TestTarget(string targetName, string testProjectPath) =>
        Target(targetName, dependsOn: [Restore], () =>
            RunAsync(
                "dotnet",
                $"test --project {testProjectPath} -c Release --no-restore --report-xunit-trx " +
                    $"--report-xunit-trx-filename {testProjectPath.Replace('/', '-')}-tests.trx",
                RepoRoot.Value));