Adds support for PUID/PGID to Docker.

[spencerhughes]

Adds support for changing the UID and GID at runtime by executing the app from a wrapper script that creates a container user with the appropriate UID/GID. Also updates the documentation to reflect the two new variables. I built an image based on this that's available for testing at spencerhughes/podgrab.

Fixes for #16 #12

[ksurl]

no user creation needed if you use su-exec and specify the UID and GID directly

apk add su-exec

su-exec ${PUID:-1000}:${PGID:-1000} app

you could set ENV=1000 instead of using default value in bash variable

[ksurl]

you can also user -u in docker cli or user: in compose

[spencerhughes]

Oh cool I didn't know about su-exec, I'll update the branch to use that methodology instead.

EDIT: ok the branch has been updated to use su-exec. I also forgot to chown the app folders so I fixed that too.

[akhilrex]

Hi

Sorry for the delay. Got tied up with some work. Thanks a lot for this. Let me test this locally and merge this.

[alanwink13]

Hey

Any chance to have this merged? This option seems necessary to make Podgrab work with NFS shares (or at least to make it work in my setup 😛).