wrong switch for adduser

[angryfish404]

Hi,
in line 13 of the Dockerfile the switch -g is used to add the user to group jira. -g stands for GECOS-Field. This only seems to be the case on busybox. (try adduser --help)
The switch for group is -G. In my case, the user was added to group nogroup and had no rights to open outgoing ports. I changed the line to "&& adduser -S -u 1000 jira -G jira " and everything works fine now.