[oe] ADMIN: git gc on git.openembedded.org

[Holger Hans Peter Freyther]

Hey,

just a quick note. When migrating the git from the old to new place a simple 
cronjob was lost.

I have recreated this cronjob. Using crontab -e, I have added a @monthly 
/home/git/git_gc.sh script that will iterate through the repositories and call 
git gc --aggressive.

It is my understanding that git gc is nowadays race free and can be used on 
servers.

z.