v0.16.0

Changed

• Raised Minimum Supported Rust Version (MSRV) to 1.74. (#747)
• Improved the consistency of all user-facing libcnb.rs error message wordings. (#722)
• The assistance error message shown when the necessary cross-compilation tools are not found now also includes the rustup target add step. (#729)
• Updated the documentation for TestRunner::build and TestContext::start_container to mention when Docker resource teardown occurs. (#743)

Fixed

• libcnb-test:
  • Fixed incorrect error messages being shown for buildpack compilation/packaging failures. (#720)
  • The Docker volumes created by Pack for the build and launch layer caches are now cleaned up after each test. (#741)
  • The Docker image cleanup process no longer makes duplicate attempts to remove images when using TestContext::rebuild. (#741)
  • Test failures due to the Docker daemon not being installed or started no longer cause a non-unwinding panic abort with noisy traceback. (#741)
  • Containers created by TestContext::start_container are now correctly cleaned up if the container failed to start. (#742)