/usr/share/move_base_msgs/action/MoveBase.action is in libmove-base-msgs-dev 1.13.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | geometry_msgs/PoseStamped target_pose
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geometry_msgs/PoseStamped base_position
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