Fix another instance of composer running as root.

[adam-vessey]

Similar to #227, appears that the CrayFits installation was running as an unspecified user (so would be executed as the user running everything? root, apparently?)... so let's specify it.

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Error encountered:

TASK [Islandora-Devops.fits : Run Composer On Fits Microservice] ***************
Thursday 15 September 2022  16:20:22 -0300 (0:00:00.544)       0:04:51.626 ****
fatal: [default]: FAILED! => {"changed": false, "msg": "Do not run Composer as root/super user! See https://getcomposer.org/root for details Aborting as no plugin should be loaded if running as super user is not explicitly allowed"}
...ignoring

... and checking on the system, the project doesn't appear to have been installed:

vagrant@islandora8:/var/www/html/CrayFits$ ls -l vendor
ls: cannot access 'vendor': No such file or directory
vagrant@islandora8:/var/www/html/CrayFits