Added details about homebrew in macOS documentation (#84) #403

Job	Run time
Install Gazebo on macOS (macos-13)	36m 53s
Unit testing action on GitHub runners (ubuntu-20.04)	25s
Install Gazebo on Ubuntu GitHub runner (ubuntu-20.04, citadel)	1m 44s
Install Gazebo on macOS (macos-14)	37m 21s
Unit testing action in a docker container (ubuntu:focal)	27s
Unit testing action on GitHub runners (ubuntu-22.04)	19s
Install Gazebo on Ubuntu GitHub runner (ubuntu-20.04, fortress)	1m 51s
Unit testing action in a docker container (ubuntu:jammy)	21s
Unit testing action on GitHub runners (ubuntu-24.04)	22s
Install Gazebo on Ubuntu GitHub runner (ubuntu-20.04, garden)	1m 26s
Unit testing action in a docker container (ubuntu:noble)	22s
Install Gazebo on Ubuntu docker (ubuntu:focal, citadel)	1m 33s
Install Gazebo on Ubuntu GitHub runner (ubuntu-22.04, harmonic)	1m 15s
Install Gazebo on Ubuntu GitHub runner (ubuntu-24.04, harmonic)	1m 12s
Install Gazebo on Ubuntu docker (ubuntu:focal, fortress)	1m 36s
Install Gazebo nightly on Ubuntu docker	1m 12s
Install Gazebo pre-release on Ubuntu docker (ubuntu:jammy)	1m 21s
Install Gazebo on Ubuntu docker (ubuntu:focal, garden)	1m 41s
Install Gazebo pre-release on Ubuntu docker (ubuntu:noble)	1m 15s
Install Gazebo on Ubuntu docker (ubuntu:jammy, harmonic)	1m 7s
Install Gazebo on Windows	7m 3s
Install Humble and Fortress side-by-side	4m 8s
Install Gazebo on Ubuntu docker (ubuntu:noble, harmonic)	1m 24s
Install Iron and Harmonic side-by-side	3m 19s
	1h 49m 37s

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