Preserve PATH CMake in Windows vcpkg env bootstrap

[Copilot]

Windows builds could invoke Visual Studio’s bundled CMake (4.x) during vcpkg dependency builds, even when workflows had already installed/pinned CMake via lukka/get-cmake. This came from the default runVcpkgEnvFormatString including --tools, which can reorder PATH toward toolchain-provided binaries.

• Default behavior change (action input)

  • Updated runVcpkgEnvFormatString default in action.yml to remove --tools.
  • Result: vcpkg env no longer prefers VS-integrated CMake by default; CMake already on PATH (e.g. from get-cmake) remains preferred.

• Documentation clarity

  • Added README note explaining the new default and why.
  • Documented opt-in path for users who still want --tools via explicit runVcpkgEnvFormatString.

• Regression guard

  • Added a focused unit assertion ensuring the default string does not reintroduce --tools.

# before
runVcpkgEnvFormatString: "[`env`, `--bin`, `--include`, `--tools`, `--python`, `--triplet`, `$[env.VCPKG_DEFAULT_TRIPLET]`, `set`]"

# after
runVcpkgEnvFormatString: "[`env`, `--bin`, `--include`, `--python`, `--triplet`, `$[env.VCPKG_DEFAULT_TRIPLET]`, `set`]"

[lukka]

@copilot Instead of changing the existing behavior, why not simply document how to omit the --tools flag so that tool paths are not added to the PATH environment variable.

[Copilot]

@copilot Instead of changing the existing behavior, why not simply document how to omit the --tools flag so that tool paths are not added to the PATH environment variable.

Implemented in 33b98df: restored the original default (keeps --tools) and updated the README to document how to omit --tools by setting a custom runVcpkgEnvFormatString.

@copilot Instead of changing the existing behavior, why not simply document how to omit the --tools flag so that tool paths are not added to the PATH environment variable.

Implemented in 33b98df: restored the original default (keeps --tools) and updated the README to document how to omit --tools by setting a custom runVcpkgEnvFormatString.