John Blackbourn 29531de768 Build/Test Tools: Install the Composer package dependencies within the Docker environment as part of the local development environment installation and testing processes.
This makes the use of Composer on the host machine optional when using the Docker environment, which means there is no change to the process for installing, updating, and running the tests since [51559].

Props hellofromTonya, azaozz, netweb, desrosj, jrf, johnbillion

Fixes #53945


git-svn-id: https://develop.svn.wordpress.org/trunk@51685 602fd350-edb4-49c9-b593-d223f7449a82
2021-08-28 21:16:22 +00:00
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