Add CodeQL security scanning (#6188)
Add CodeQL security scanning (#6188)

Co-authored-by: ᴜɴᴋɴᴡᴏɴ <51e69892ab49df85c6230ccc57f8e1d1606caccc@gogs.io>
gogits/gogs,chriswatt/gogs,mukaiu/gogs,mukaiu/gogs,chriswatt/gogs,mukaiu/gogs,gogits/gogs,gogits/gogs,chriswatt/gogs