write megalinter-reports as current user instead of root

[gbrandt1]

i think it's quite annoying and unneccessary that megalinter-reports/ gets written as the root user.
especially for users that don't have sudo rights to fix it.
i guess this comes from running the docker container as root and ignoring the current user.

it would be better to either run as the current user, or change the owner of megalinter-reports to the current user by default.

a --user option should be added to mega-linter-runner.

cheers,
gerhard

[nvuillam]

Related to #1985
cc @Kurt-von-Laven

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[Kurt-von-Laven]

Duplicate #1975. I recommend using rootless Docker in the meantime. See ScribeMD/rootless-docker for a GitHub Actions that does this. Alternatively, on beta you can set REPORT_OUTPUT_FOLDER: none in your MegaLinter config to disable generation of the report folder entirely.