Recommend APT package as default installation method. Update CI to use new Rolling.

[bmchalenv]

The APT package was released but the README.md was never updated to recommend its use.

Also forced to update CI to use the newest Rolling which is on Ubuntu resolute and its apt packages are found on the ros2-testing apt server.

[greptile-apps]

Greptile Summary

The PR makes the released APT package the recommended installation method and updates Rolling support to Ubuntu Resolute with the ROS 2 testing repository.

• Adds an APT installation command and ROS environment prerequisite.
• Moves Rolling CI and Docker targets from Noble to Resolute.
• Configures Rolling package builds and tests to use ros2-testing.
• Adds Resolute support to Debian package generation.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
README.md	Recommends APT installation, requires the intended ROS environment to be sourced, and removes the incorrect Jazzy fallback.
.github/workflows/debian-packages.yml	Moves Rolling package generation and smoke tests to Resolute and uses the ROS 2 testing repository.
.github/workflows/ros-tests.yml	Updates the Rolling test target to Resolute with packages sourced from ros2-testing.
scripts/build_debian_packages.sh	Adds Resolute packaging support and selects ros2-testing when building Rolling packages.
scripts/docker-test.sh	Updates the Rolling development container image from Noble to Resolute.

_{Reviews (5): Last reviewed commit: "Use testing apt repo for ROS Rolling" | Re-trigger Greptile}