manage Change UID GID

[vincentDcmps]

hello,

I propose this pull request to implement rsync execution with different UID/GID than root
for this I have add su-exec instalaltion in docker file

Use case: NFS share with specific user right

[maxileith]

@valentinab25 Have you considered that change? The change would help me as well.

[merwok]

I think the program should have default non-root uid/gid to run normally.

But to change that uid/gid, why add su-exec and custom envvars instead of using normal docker run --user option?

[timj]

I just ran into this issue. I tried setting --user but then the container won't start because it can't find the ssh keys (I have mounted them separately). Rsync as root and then relying on the client to use --chown seems bad to me and I would feel a lot better if I knew that the file system I was writing to on the server had restricted user permissions.