Add documentation for testing options and arm64 builds

[Copilot]

Add documentation to CONTRIBUTING.md for running tests without building images, running specific tests, and building on arm64 devices.

Documentation (CONTRIBUTING.md)

• Running Tests Without Building Images: Use -PullImages with run-tests.ps1 to test published images without building locally
• Running Specific Tests: Use -CustomTestFilter with Xunit test filtering expressions
• arm64 Builds: Use -Architecture arm64 (not arm64v8) for Apple Silicon/Linux ARM64

Script (build-and-test.ps1)

• Added -CustomTestFilter parameter that passes through to run-tests.ps1 for all test invocations

Example Usage

# Test published images without building
./tests/run-tests.ps1 -PullImages -Paths '*9.0*noble*'

# Run specific tests
./tests/run-tests.ps1 -Paths '*9.0*noble*' -CustomTestFilter "FullyQualifiedName~VerifyEnvironmentVariables"

# Build on arm64
./build-and-test.ps1 -Paths '*9.0*noble*' -Architecture arm64

Original prompt

Add a section to CONTRIBUTING.md about 1.) running tests without building images, and 2.) running specific tests. Running tests without building can be done using the ./tests/run-tests.ps1 script with the -PullImages argument. Running specific tests can be done with either run-tests.ps1 or build-and-test.ps1 using the -CustomTestFilter argument. Also, add a section about building and running on arm64 devices. To properly build or run on arm64, you need to pass the -Architecture "arm64" argument ("arm64v8" does not work)

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