set Adwaita Icon-Theme as default

Dockerfile

@@ -59,7 +59,9 @@ RUN sed -i 's/^Types: deb$/Types: deb deb-src/' /etc/apt/sources.list.d/debian.s
 
 RUN sed -i '/%users/s/^/# /' /etc/sudoers && \
     echo "sudoers: files sss" >> /etc/nsswitch.conf && \
-    echo "session required pam_mkhomedir.so skel=/etc/skel/ umask=0077" >> /etc/pam.d/common-session
+    echo "session required pam_mkhomedir.so skel=/etc/skel/ umask=0077" >> /etc/pam.d/common-session && \
+    mkdir -p /etc/skel/.config/lxqt && \
+    printf "[Appearance]\nicon_theme=Adwaita\n" > /etc/skel/.config/lxqt/lxqt.conf
 
 RUN chmod 440 /etc/sudoers && \
     mkdir -p /etc/sssd && chown root:root /etc/sssd && chmod 755 /etc/sssd && \