Set DESKTOP_APPGROUPS_SELECTED to empty for nightly desktop images

Remove default programming app groups from nightly GNOME, XFCE, and
RISC-V XFCE desktop builds to reduce image size.

Signed-off-by: Igor Pecovnik <igor@armbian.com>

Author: igorpecovnik

scripts/generate_targets.py

@@ -1054,7 +1054,7 @@ def generate_nightly_yaml(conf_wip_boards, manual_content=""):
       BUILD_DESKTOP: "yes"
       DESKTOP_ENVIRONMENT: "gnome"
       DESKTOP_ENVIRONMENT_CONFIG_NAME: "config_base"
-      DESKTOP_APPGROUPS_SELECTED: "programming"
+      DESKTOP_APPGROUPS_SELECTED: ""
     items:
       - *nightly-fast-hdmi
 """
@@ -1075,7 +1075,7 @@ def generate_nightly_yaml(conf_wip_boards, manual_content=""):
       BUILD_DESKTOP: "yes"
       DESKTOP_ENVIRONMENT: "xfce"
       DESKTOP_ENVIRONMENT_CONFIG_NAME: "config_base"
-      DESKTOP_APPGROUPS_SELECTED: "programming"
+      DESKTOP_APPGROUPS_SELECTED: ""
     items:
       - *nightly-slow-hdmi
 """
@@ -1096,7 +1096,7 @@ def generate_nightly_yaml(conf_wip_boards, manual_content=""):
       BUILD_DESKTOP: "yes"
       DESKTOP_ENVIRONMENT: "xfce"
       DESKTOP_ENVIRONMENT_CONFIG_NAME: "config_base"
-      DESKTOP_APPGROUPS_SELECTED: "programming"
+      DESKTOP_APPGROUPS_SELECTED: ""
     items:
       - *nightly-riscv64
 """