ci: trigger builds on ros2_medkit_updated dispatch

[bburda]

Description

Adds a repository_dispatch trigger (ros2_medkit_updated event type) so ros2_medkit CI can notify selfpatch_demos to run a docker-build verification whenever ros2_medkit merges to main. Without this, breakages in ros2_medkit that affect the demo images go undetected until someone manually runs selfpatch_demos CI.

Also adds a Show triggering source step as the first step in the docker-build job. When triggered by repository_dispatch, it writes a step summary with the source commit SHA and a link to the ros2_medkit run - making it easy to trace a failed demo build back to the ros2_medkit change that caused it.

Related Issue

closes selfpatch/ros2_medkit#224

Checklist

• Tested locally
• README updated (if needed)

[Copilot]

Pull request overview

Updates CI to allow ros2_medkit to trigger selfpatch_demos docker image build verification via repository_dispatch, and adds a small traceability summary when that happens. Also adjusts demo runner scripts to consolidate docker-compose invocation and adds cleanup behavior on build failure, plus aligns the MoveIt demo Dockerfile with the other demos’ ROS2MedkitCompat.cmake handling.

Changes:

• Add repository_dispatch trigger (ros2_medkit_updated) to CI and show source metadata in the job summary when dispatch-triggered.
• Refactor demo run-demo.sh scripts to select a COMPOSE_CMD and add a “build failed” cleanup path.
• Update MoveIt Pick-and-Place Dockerfile to install ROS2MedkitCompat.cmake into ${COLCON_WS}/cmake.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
demos/turtlebot3_integration/run-demo.sh	Consolidates compose command selection; adds cleanup on build failure.
demos/sensor_diagnostics/run-demo.sh	Same compose refactor; adds cleanup on build failure (with a ShellCheck concern).
demos/moveit_pick_place/run-demo.sh	Same compose refactor; adds cleanup on build failure.
demos/moveit_pick_place/Dockerfile	Moves ROS2MedkitCompat.cmake into workspace cmake dir like other demos.
.github/workflows/ci.yml	Adds repository_dispatch trigger and dispatch-only “source” step summary output.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

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