fix(debos/rootfs): Only use fastrpc group when present

The fastrpc group is created by fastrpc-support which is only installed
on Debian. Check for the group with getent before adding it to the
useradd --groups list to avoid failures on Ubuntu.

Signed-off-by: Loïc Minier <loic.minier@oss.qualcomm.com>
Signed-off-by: Agathe Porte <agathe.porte@oss.qualcomm.com>

Author: lool

debos-recipes/qualcomm-linux-debian-rootfs.yaml

@@ -230,8 +230,13 @@ actions:
       # some useful groups for desktop scenarios, but also to run payloads
       # from the serial console, over SSH, or in containers - where the desktop
       # session has not updated ACLs to the device nodes
+      groups="adm,audio,render,sudo,users,video"
+      # fastrpc group only exists when fastrpc-support is installed (Debian)
+      if getent group fastrpc >/dev/null 2>&1; then
+        groups="${groups},fastrpc"
+      fi
       useradd --create-home --shell /bin/bash --user-group \
-          --groups adm,audio,fastrpc,render,sudo,users,video debian
+          --groups "$groups" debian
       # set password to "debian"
       echo debian:debian | chpasswd
       # password must be changed on first login