add CTest support and enable testing in CMake configuration

[nbassler]

No description provided.

[Copilot]

Pull request overview

This PR wires up CTest at the top-level CMake configuration and runs the test suite in GitHub Actions, aiming to make tests discoverable and executable from the build directory.

Changes:

• Enable CTest in the root CMakeLists.txt so ctest can discover tests from the build root.
• Update test/CMakeLists.txt (rename the test executable to dedx_test, rely on top-level enable_testing()).
• Run ctest in CI on Linux; adjust a custom command dependency line in buildbins.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
CMakeLists.txt	Enables testing at the top level for CTest discovery.
test/CMakeLists.txt	Renames a test executable and relies on root-level test enablement.
buildbins/CMakeLists.txt	Removes a dependency declaration from a custom command associated with binary_table.
.github/workflows/docs.yml	Adds a Linux-only step to execute ctest in CI.

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